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Longer titles found: Invariant-based programming (view), Invariant (mathematics) (view), Invariant (physics) (view), Invariant basis number (view), Invariant convex cone (view), Invariant decomposition (view), Invariant differential operator (view), Invariant estimator (view), Invariant extended Kalman filter (view), Invariant factor (view), Invariant factorization of LPDOs (view), Invariant manifold (view), Invariant mass (view), Invariant measure (view), Invariant of a binary form (view), Invariant polynomial (view), Invariant set postulate (view), Invariant sigma-algebra (view), Invariant speed (view), Invariant subspace (view), Invariant subspace problem (view), Invariant theory (view), Invariants of tensors (view), Linear time-invariant system (view), Gromov–Witten invariant (view), J-invariant (view), Perfect digital invariant (view), Perfect digit-to-digit invariant (view), Knot invariant (view), Scale-invariant feature transform (view), Time-invariant system (view), Finite type invariant (view), De Sitter invariant special relativity (view), Quasi-invariant measure (view), Arf invariant of a knot (view), Loop-invariant code motion (view), Geometric invariant theory (view), Adiabatic invariant (view), Quantum invariant (view), Mucosal-associated invariant T cell (view), Oxford University Invariant Society (view), Loop invariant (view), Riemann invariant (view), Hopf invariant (view), Seiberg–Witten invariants (view), Arf invariant (view), Dehn invariant (view), Kervaire invariant (view), Class invariant (view), Differential invariant (view), Lagrange invariant (view), Eta invariant (view), Colin de Verdière graph invariant (view), Kontsevich invariant (view), Parry–Sullivan invariant (view), Normally hyperbolic invariant manifold (view), Casson invariant (view), Positively invariant set (view), Curvature invariant (view), Complete set of invariants (view), Modular invariant theory (view), U-invariant (view), Rost invariant (view), Writer invariant (view), Zeuthen–Segre invariant (view), Birational invariant (view), Hasse invariant of a quadratic form (view), Hasse invariant of an algebra (view), Glossary of invariant theory (view), Gopakumar–Vafa invariant (view), Novikov–Shubin invariant (view)

searching for Invariant 230 found (5786 total)

alternate case: invariant

Tisserand's parameter (751 words) [view diff] exact match in snippet view article find links to article

Tisserand's parameter (or Tisserand's invariant) is a number calculated from several orbital elements (semi-major axis, orbital eccentricity, and inclination)
Physical constant (2,539 words) [view diff] no match in snippet view article find links to article
A physical constant, sometimes fundamental physical constant or universal constant, is a physical quantity that cannot be explained by a theory and therefore
GNU Free Documentation License (3,204 words) [view diff] exact match in snippet view article find links to article
giving readers the rights to copy, redistribute, and modify (except for "invariant sections") a work and requires all copies and derivatives to be available
Plural (1,998 words) [view diff] no match in snippet view article find links to article
In many languages, a plural (sometimes abbreviated as pl., pl, PL., or PL), is one of the values of the grammatical category of number. The plural of a
Exterior derivative (3,310 words) [view diff] no match in snippet view article find links to article
On a differentiable manifold, the exterior derivative extends the concept of the differential of a function to differential forms of higher degree. The
Lorentz covariance (2,917 words) [view diff] exact match in snippet view article find links to article
remains the same under Lorentz transformations and is said to be a Lorentz invariant (i.e., they transform under the trivial representation). An equation is
CD74 (2,221 words) [view diff] exact match in snippet view article find links to article
antigens-associated invariant chain or CD74 (Cluster of Differentiation 74), is a protein that in humans is encoded by the CD74 gene. The invariant chain (Abbreviated
Group action (5,742 words) [view diff] exact match in snippet view article find links to article
is also invariant under G, but not conversely. Every orbit is an invariant subset of X on which G acts transitively. Conversely, any invariant subset of
CPT symmetry (1,314 words) [view diff] exact match in snippet view article find links to article
holds for all physical phenomena, or more precisely, that any Lorentz invariant local quantum field theory with a Hermitian Hamiltonian must have CPT
Metric space (11,434 words) [view diff] exact match in snippet view article find links to article
for a general topological space, but it is nevertheless topologically invariant since it is equivalent to compactness.) One example of a compact space
Galilean invariance (1,732 words) [view diff] exact match in snippet view article find links to article
crucial result that implies Galilean relativity. Assuming that mass is invariant in all inertial frames, the above equation shows Newton's laws of mechanics
Exponential map (Riemannian geometry) (1,295 words) [view diff] exact match in snippet view article
subspace of TpM. In the case of Lie groups with a bi-invariant metric—a pseudo-Riemannian metric invariant under both left and right translation—the exponential
Euler characteristic (3,420 words) [view diff] exact match in snippet view article find links to article
(or Euler number, or Euler–Poincaré characteristic) is a topological invariant, a number that describes a topological space's shape or structure regardless
Inflection (6,210 words) [view diff] exact match in snippet view article find links to article
never subject to inflection are said to be invariant; for example, the English verb must is an invariant item: it never takes a suffix or changes form
Twelve-tone technique (4,370 words) [view diff] exact match in snippet view article find links to article
hexachord of I5 (D–C♯–A♭–C–G–F). Problems playing this file? See media help. Invariant formations are also the side effect of derived rows where a segment of
Twelve-tone technique (4,370 words) [view diff] exact match in snippet view article find links to article
hexachord of I5 (D–C♯–A♭–C–G–F). Problems playing this file? See media help. Invariant formations are also the side effect of derived rows where a segment of
T cell (9,249 words) [view diff] exact match in snippet view article find links to article
thymocyte expresses an invariant α-chain called pre-Tα alongside the TCRβ gene. If the rearranged β-chain successfully pairs with the invariant α-chain, signals
Casimir element (3,663 words) [view diff] exact match in snippet view article find links to article
In mathematics, a Casimir element (also known as a Casimir invariant or Casimir operator) is a distinguished element of the center of the universal enveloping
Orthogonal group (7,881 words) [view diff] exact match in snippet view article find links to article
the power of the Dickson invariant. Over fields of characteristic 2, the determinant is always 1, so the Dickson invariant gives more information than
Multi-scale camouflage (1,452 words) [view diff] exact match in snippet view article find links to article
over a range of distances, or equivalently over a range of scales (scale-invariant camouflage), in the manner of fractals, so some approaches are called
Topological group (7,560 words) [view diff] exact match in snippet view article find links to article
topology on G {\displaystyle G} . A metric d on G is called left-invariant (resp. right-invariant) if and only if d ( a x 1 , a x 2 ) = d ( x 1 , x 2 ) {\displaystyle
Riemannian manifold (8,684 words) [view diff] exact match in snippet view article find links to article
bi-invariant (that is, simultaneously left- and right-invariant). All left-invariant metrics have constant scalar curvature. Left- and bi-invariant metrics
Matroid (8,774 words) [view diff] exact match in snippet view article find links to article
Tutte-Grothendieck invariant. The Tutte polynomial is the most general such invariant; that is, the Tutte polynomial is a Tutte-Grothendieck invariant and every
Lie group–Lie algebra correspondence (4,460 words) [view diff] exact match in snippet view article find links to article
of a Lie group G. One approach uses left-invariant vector fields. A vector field X on G is said to be invariant under left translations if, for any g, h
Free-software license (6,399 words) [view diff] exact match in snippet view article find links to article
controversial "invariant section" is removed, but considers it "still not free of trouble". Notwithstanding, most GNU documentation includes "invariant sections"
Symmetry breaking (1,714 words) [view diff] exact match in snippet view article find links to article
characterized by whether the equations of motion fail to be invariant, or the ground state fails to be invariant. This section describes spontaneous symmetry breaking
Automorphic form (1,652 words) [view diff] exact match in snippet view article find links to article
topological group G to the complex numbers (or complex vector space) which is invariant under the action of a discrete subgroup Γ ⊂ G {\displaystyle \Gamma \subset
Matrix decomposition (3,580 words) [view diff] exact match in snippet view article find links to article
such as the SVD, that are invariant with respect to diagonal scaling. Applicable to: m-by-n matrix A. Unit-Scale-Invariant Singular-Value Decomposition:
Quantum amplifier (1,855 words) [view diff] exact match in snippet view article find links to article
shows how much output field differs from a coherent state. Linear phase-invariant amplifiers may be described as follows. Assume that the unitary operator
Spiral model (1,378 words) [view diff] exact match in snippet view article find links to article
with an example of a "dangerous spiral look-alike" that violates the invariant. Sequentially defining the key artifacts for a project often increases
Invariable plane (874 words) [view diff] no match in snippet view article find links to article
The invariable plane of a planetary system, also called Laplace's invariable plane, is the plane passing through its barycenter (center of mass) perpendicular
Isomorphic keyboard (971 words) [view diff] exact match in snippet view article find links to article
Transclado. Isomorphic keyboards can expose, through their geometry, two invariant properties of music theory: transpositional invariance, exposed in all
F4 (mathematics) (983 words) [view diff] exact match in snippet view article
group of automorphisms which keep the quadratic polynomials x2 + y2 + ... invariant, F4 is the group of automorphisms of the following set of 3 polynomials
Integrable system (3,407 words) [view diff] exact match in snippet view article find links to article
defining property of complete integrability) the existence of algebraic invariants, having a basis in algebraic geometry (a property known sometimes as algebraic
600-cell (28,920 words) [view diff] exact match in snippet view article find links to article
invariant planes of rotation. We say these isoclinic rotations are characteristic of the 600-cell because the 600-cell's edges lie in their invariant
Linear filter (2,743 words) [view diff] exact match in snippet view article find links to article
filters are also time invariant (or shift invariant) in which case they can be analyzed exactly using LTI ("linear time-invariant") system theory revealing
Characteristic subgroup (1,196 words) [view diff] exact match in snippet view article find links to article
characteristic in G. A subgroup of H that is invariant under all inner automorphisms is called normal; also, an invariant subgroup. ∀φ ∈ Inn(G): φ(H) ≤ H Since
Integral geometry (582 words) [view diff] exact match in snippet view article find links to article
geometrical space invariant under the symmetry group of that space. In more recent times, the meaning has been broadened to include a view of invariant (or equivariant)
Small nucleolar RNA SNORD21 (191 words) [view diff] exact match in snippet view article find links to article
Drosophila. U21 snoRNA has a 13 nucleotide region of complementarity with an invariant region of eukaryotic 28S ribosomal RNA. Qu LH, Nicoloso M, Michot B, Azum
Scalar field theory (4,903 words) [view diff] exact match in snippet view article find links to article
can refer to a relativistically invariant classical or quantum theory of scalar fields. A scalar field is invariant under any Lorentz transformation
Cubic function (1,746 words) [view diff] exact match in snippet view article find links to article
function is symmetric with respect to its inflection point; that is, it is invariant under a rotation of a half turn around this point. Up to an affine transformation
Lebesgue covering dimension (1,483 words) [view diff] exact match in snippet view article find links to article
different ways of defining the dimension of the space in a topologically invariant way. For ordinary Euclidean spaces, the Lebesgue covering dimension is
Conformal anomaly (1,611 words) [view diff] exact match in snippet view article find links to article
develops a nonzero divergence in the presence of gauge fields. A scale invariant theory, one in which there are no mass scales, will have a conserved Noether
Donaldson theory (234 words) [view diff] no match in snippet view article find links to article
In mathematics, and especially gauge theory, Donaldson theory is the study of the topology of smooth 4-manifolds using moduli spaces of anti-self-dual
T-symmetry (4,422 words) [view diff] exact match in snippet view article find links to article
conditions of the universe. The laws of gravity seem to be time reversal invariant in classical mechanics; however, specific solutions need not be. An object
Code page 1102 (276 words) [view diff] exact match in snippet view article find links to article
is called DUTCH by Kermit. Although NL7DEC complies with the ISO 646 invariant layout (and is hence a close derivation from ASCII, with only nine code
Kolmogorov–Arnold–Moser theorem (1,243 words) [view diff] exact match in snippet view article find links to article
Pinzari showed how to eliminate this degeneracy by developing a rotation-invariant version of the theorem. The KAM theorem is usually stated in terms of
Exponential map (Lie theory) (2,325 words) [view diff] exact match in snippet view article
exist a Riemannian metric invariant under both left and right translations. Although there is always a Riemannian metric invariant under, say, left translations
Proper length (1,169 words) [view diff] exact match in snippet view article find links to article
dependent on the observer. A different term, proper distance, provides an invariant measure whose value is the same for all observers. Proper distance is
BF model (394 words) [view diff] exact match in snippet view article find links to article
+\mathbf {A} \wedge \mathbf {A} } This action is diffeomorphically invariant and gauge invariant. Its Euler–Lagrange equations are F = 0 {\displaystyle \mathbf
24-cell (30,655 words) [view diff] exact match in snippet view article find links to article
dimensions a spinning polyhedron has a single invariant central plane of rotation. The plane is an invariant set because each point in the plane moves in
Gravitational singularity (2,887 words) [view diff] exact match in snippet view article find links to article
problem. A singularity in general relativity can be defined by the scalar invariant curvature becoming infinite or, better, by a geodesic being incomplete
Seax (884 words) [view diff] exact match in snippet view article find links to article
A seax (Old English pronunciation: [ˈsæɑks]; also sax, sæx, sex; invariant in plural, latinized sachsum) is a small sword, fighting knife or dagger typical
Gnu code (310 words) [view diff] exact match in snippet view article find links to article
of quantum error correcting codes, with the special property of being invariant under permutations of the qubits. Given integers g (the gap), n (the occupancy)
Topology (4,214 words) [view diff] exact match in snippet view article find links to article
considered in topology are homeomorphisms and homotopies. A property that is invariant under such deformations is a topological property. The following are basic
Rotation (4,090 words) [view diff] exact match in snippet view article find links to article
which is an invariant subspace under the application of A. Therefore, they span an invariant plane. This plane is orthogonal to the invariant axis, which
Lamé's stress ellipsoid (741 words) [view diff] exact match in snippet view article find links to article
stress invariant I 1 {\displaystyle I_{1}\,\!} is directly proportional to the sum of the principal radii of the ellipsoid. The second stress invariant I 2
Theoretical physics (2,624 words) [view diff] exact match in snippet view article find links to article
concerned with the Lorentz transformation which left Maxwell's equations invariant, but was apparently uninterested in the Michelson–Morley experiment on
J-homomorphism (923 words) [view diff] exact match in snippet view article find links to article
the (cyclic) image of the J-homomorphism, and the kernel of the Adams e-invariant (Adams 1966), a homomorphism from the stable homotopy groups to Q / Z
Conformal gravity (1,009 words) [view diff] exact match in snippet view article find links to article
theories that are invariant under conformal transformations in the Riemannian geometry sense; more accurately, they are invariant under Weyl transformations
Shin'ichirō Tomonaga (1,017 words) [view diff] exact match in snippet view article find links to article
Chicago Press. ISBN 0-226-80794-0. Tomonaga, S. "On a Relativistically Invariant Formulation of the Quantum Theory of Wave Fields." Prog. Theor. Phys.
Asymmetry (2,610 words) [view diff] exact match in snippet view article find links to article
absence of, or a violation of, symmetry (the property of an object being invariant to a transformation, such as reflection). Symmetry is an important property
Symmetric space (4,599 words) [view diff] exact match in snippet view article find links to article
manifold is a symmetric space if and only if its curvature tensor is invariant under parallel transport. More generally, a Riemannian manifold (M, g)
Lie algebra representation (4,312 words) [view diff] exact match in snippet view article find links to article
only if every invariant subspace of V has an invariant complement. (That is, if W is an invariant subspace, then there is another invariant subspace P such
BIBO stability (1,150 words) [view diff] exact match in snippet view article find links to article
|y(t)|\leq B)\quad t\in \mathbb {R} } For a continuous time linear time-invariant (LTI) system, the condition for BIBO stability is that the impulse response
Scalar (171 words) [view diff] exact match in snippet view article find links to article
number Lorentz scalar, a quantity in the theory of relativity which is invariant under a Lorentz transformation Pseudoscalar, a quantity that behaves like
Subgroup series (1,464 words) [view diff] exact match in snippet view article find links to article
their relations, and several subgroup series can be invariantly defined and are important invariants of groups. A subgroup series is used in the subgroup
Non-critical string theory (810 words) [view diff] exact match in snippet view article find links to article
does not describe a Lorentz invariant background. However, there are recent developments which make possible Lorentz invariant quantization of string theory
ISO/IEC 646 (5,562 words) [view diff] exact match in snippet view article find links to article
set of 82 unique graphic characters to 7-bit code points, known as the invariant (INV) or basic character set, including letters of the ISO basic Latin
Stationary wavelet transform (1,592 words) [view diff] exact match in snippet view article find links to article
trous Quasi-continuous wavelet transform Translation invariant wavelet transform Shift invariant wavelet transform Cycle spinning Maximal overlap wavelet
Tense–aspect–mood (7,063 words) [view diff] exact match in snippet view article find links to article
morphemes. Tense, aspect, and mood are usually indicated with separate invariant pre-verbal auxiliaries. Typically the unmarked verb is used for either
Linearly ordered group (1,427 words) [view diff] exact match in snippet view article find links to article
that is translation-invariant. This may have different meanings. We say that (G, ≤) is a: left-ordered group if ≤ is left-invariant, that is a ≤ b implies
Scalar boson (406 words) [view diff] exact match in snippet view article find links to article
transform like a scalar under Lorentz transformation (i.e. are Lorentz invariant). A pseudoscalar boson is a scalar boson that has odd parity, whereas
Immirzi parameter (1,524 words) [view diff] exact match in snippet view article find links to article
however the dynamics of such a model has not yet been studied. For scale-invariant dilatonic theories of gravity with standard model-type matter couplings
Doubly special relativity (1,759 words) [view diff] exact match in snippet view article find links to article
physics experiments. Since the de Sitter group naturally incorporates an invariant length parameter, de Sitter relativity can be interpreted as an example
Charge (physics) (1,269 words) [view diff] exact match in snippet view article
color charge in quantum chromodynamics. Charges correspond to the time-invariant generators of a symmetry group, and specifically, to the generators that
Armenian calendar (705 words) [view diff] exact match in snippet view article find links to article
Armenia is the Gregorian calendar. The Armenian calendar was based on an invariant year length of 365 days. Because a solar year is about 365.25 days and
Stanley Mandelstam (540 words) [view diff] exact match in snippet view article find links to article
South African theoretical physicist. He introduced the relativistically invariant Mandelstam variables into particle physics in 1958 as a convenient coordinate
Cardinal function (2,103 words) [view diff] exact match in snippet view article find links to article
In mathematics, a cardinal function (or cardinal invariant) is a function that returns cardinal numbers. The most frequently used cardinal function is
Unparticle physics (860 words) [view diff] exact match in snippet view article find links to article
Standard Model of particle physics, because its components are scale invariant. Howard Georgi proposed this theory in two 2007 papers, "Unparticle Physics"
Killing form (1,865 words) [view diff] exact match in snippet view article find links to article
algebra are invariant under the adjoint group, from which it follows that the Killing form (i.e. the degree 2 coefficient) is invariant, but he did not
Wald test (2,232 words) [view diff] exact match in snippet view article find links to article
However, a major disadvantage is that (in finite samples) it is not invariant to changes in the representation of the null hypothesis; in other words
Loop quantum cosmology (1,111 words) [view diff] exact match in snippet view article find links to article
no definitive discrete gaps or a minimum size. Consequently, in scale-invariant LQC, the Big Bang is shown not to be replaced by a quantum bounce. Big
Representation theory of the Poincaré group (584 words) [view diff] exact match in snippet view article find links to article
state of the system is determined by the Schrödinger equation, which is invariant under Galilean transformations. Quantum field theory is the relativistic
Helicity (particle physics) (806 words) [view diff] exact match in snippet view article
and thus, in the absence of external forces, is time-invariant. It is also rotationally invariant, in that a rotation applied to the system leaves the
Resolvent (Galois theory) (1,317 words) [view diff] exact match in snippet view article
said to be an invariant of G. Conversely, given a subgroup G of Sn, an invariant of G is a resolvent invariant for G if it is not an invariant of any bigger
Gaussian random field (262 words) [view diff] exact match in snippet view article find links to article
fluctuations during cosmic inflation are thought to be a GRF with a nearly scale invariant spectrum. One way of constructing a GRF is by assuming that the field
Complexe sonore (205 words) [view diff] exact match in snippet view article find links to article
rotation by minor thirds under which the octatonic background scale is invariant." Dmitri Tymoczko argues that Stravinsky's octatonicism results "from
G2 (mathematics) (2,056 words) [view diff] no match in snippet view article
In mathematics, G2 is three simple Lie groups (a complex form, a compact real form and a split real form), their Lie algebras g 2 , {\displaystyle {\mathfrak
Complexe sonore (205 words) [view diff] exact match in snippet view article find links to article
rotation by minor thirds under which the octatonic background scale is invariant." Dmitri Tymoczko argues that Stravinsky's octatonicism results "from
Stochastic calculus (620 words) [view diff] exact match in snippet view article find links to article
Itô's lemma. This enables problems to be expressed in a coordinate system invariant form, which is invaluable when developing stochastic calculus on manifolds
Time-translation symmetry (1,054 words) [view diff] exact match in snippet view article find links to article
Time-translation symmetry is the law that the laws of physics are unchanged (i.e. invariant) under such a transformation. Time-translation symmetry is a rigorous
Statistical dispersion (936 words) [view diff] exact match in snippet view article find links to article
statistical dispersion have the useful property that they are location-invariant and linear in scale. This means that if a random variable X {\displaystyle
Bunch–Davies vacuum (484 words) [view diff] exact match in snippet view article find links to article
whole class of quantum states over a background de Sitter space which are invariant under all the isometries: the alpha-vacua. Among them there is a particular
Chirality (mathematics) (975 words) [view diff] exact match in snippet view article
{\displaystyle F} is a line L {\displaystyle L} , such that F {\displaystyle F} is invariant under the mapping ( x , y ) ↦ ( x , − y ) {\displaystyle (x,y)\mapsto
120-cell (14,824 words) [view diff] exact match in snippet view article find links to article
double rotations, points rotate within invariant central planes of rotation by some angle, and the entire invariant central plane of rotation also tilts
Dipole model of the Earth's magnetic field (625 words) [view diff] exact match in snippet view article find links to article
invariant latitude and L {\displaystyle L} is the L-shell describing the magnetic field line in question. On the surface of the earth, the invariant latitude
Arthur–Selberg trace formula (2,258 words) [view diff] exact match in snippet view article find links to article
operators and have the disadvantage that they are not invariant. Arthur later found the invariant trace formula and the stable trace formula which are
Calpain-6 (245 words) [view diff] exact match in snippet view article find links to article
(papain-like proteases). The calpain proteins are heterodimers consisting of an invariant small subunit and variable large subunits. The large subunit possesses
Kirby–Siebenmann class (261 words) [view diff] no match in snippet view article find links to article
In mathematics, more specifically in geometric topology, the Kirby–Siebenmann class is an obstruction for topological manifolds to allow a PL-structure
Geometrization conjecture (4,062 words) [view diff] exact match in snippet view article find links to article
3-dimensional Lie groups. Most Thurston geometries can be realized as a left invariant metric on a Bianchi group. However S2 × R cannot be, Euclidean space corresponds
W. B. R. Lickorish (319 words) [view diff] exact match in snippet view article find links to article
and knot theory. He was one of the discoverers of the HOMFLY polynomial invariant of links, and proved the Lickorish-Wallace theorem which states that all
Jus commune (1,053 words) [view diff] exact match in snippet view article find links to article
civil law jurists to refer to those aspects of the civil law system's invariant legal principles, sometimes called "the law of the land" in English law
Fermat's spiral (1,807 words) [view diff] exact match in snippet view article find links to article
the area between any two consecutive full turns around the spiral is invariant. As a result, the distance between turns grows in inverse proportion to
Higgs mechanism (6,697 words) [view diff] exact match in snippet view article find links to article
mechanism reformulates the Higgs mechanism in an entirely gauge invariant way, generally leading to the same results. The mechanism was proposed
Calpain-9 (498 words) [view diff] exact match in snippet view article find links to article
cysteine proteases. The calpain proteins are heterodimers consisting of an invariant small subunit and variable large subunits. The large subunit possesses
Biomolecule (2,385 words) [view diff] exact match in snippet view article find links to article
of molecules (the biomolecules) and of certain metabolic pathways are invariant features among the wide diversity of life forms; thus these biomolecules
Lusternik–Schnirelmann category (393 words) [view diff] exact match in snippet view article find links to article
LS-category) of a topological space X {\displaystyle X} is the homotopy invariant defined to be the smallest integer number k {\displaystyle k} such that
Self-similarity (1,362 words) [view diff] exact match in snippet view article find links to article
instance, a side of the Koch snowflake is both symmetrical and scale-invariant; it can be continually magnified 3x without changing shape. The non-trivial
Biomolecule (2,385 words) [view diff] exact match in snippet view article find links to article
of molecules (the biomolecules) and of certain metabolic pathways are invariant features among the wide diversity of life forms; thus these biomolecules
Eledoisin (313 words) [view diff] exact match in snippet view article find links to article
same consensus C-terminal sequence, that is, Phe-Xxx-Gly-Leu-Met-NH. The invariant "Phe7" residue is probably required for receptor binding. "Xxx" is either
Julian Schwinger (3,037 words) [view diff] exact match in snippet view article find links to article
electrodynamics (QED), in particular for developing a relativistically invariant perturbation theory, and for renormalizing QED to one loop order. Schwinger
Dual (category theory) (753 words) [view diff] exact match in snippet view article
every morphism of C.) Duality, as such, is the assertion that truth is invariant under this operation on statements. In other words, if a statement S is
Kazhdan's property (T) (1,756 words) [view diff] exact match in snippet view article
acts unitarily on a Hilbert space and has "almost invariant vectors", then it has a nonzero invariant vector. The formal definition, introduced by David
Demeter (satellite) (471 words) [view diff] exact match in snippet view article
14 orbits per day and measures continuously between -65° and +65° of invariant latitude. DEMETER observed an increase in ultra low frequency radio waves
Synthetic differential geometry (229 words) [view diff] exact match in snippet view article find links to article
geometry. For example, the meaning of what it means to be natural (or invariant) has a particularly simple expression, even though the formulation in
CAPN5 (644 words) [view diff] exact match in snippet view article find links to article
variety of cellular processes. A functional calpain protein consists of an invariant small subunit and 1 of a family of large subunits. CAPN5 is one of the
James Cronin (1,585 words) [view diff] exact match in snippet view article find links to article
reaction, which showed that the interactions of subatomic particles are not invariant under time reversal. Thus the phenomenon of CP violation was discovered
Conjunction (grammar) (2,484 words) [view diff] exact match in snippet view article
conjunction in "he left after they fought". In general, a conjunction is an invariant (non-inflecting) grammatical particle that stands between conjuncts. A
Representation theory of the Galilean group (1,472 words) [view diff] exact match in snippet view article find links to article
subgroup of the affine group on (t, x, y, z), whose linear part leaves invariant both the metric (gμν = diag(1, 0, 0, 0)) and the (independent) dual metric
Gyrovector space (4,090 words) [view diff] no match in snippet view article find links to article
A gyrovector space is a mathematical concept proposed by Abraham A. Ungar for studying hyperbolic geometry in analogy to the way vector spaces are used
Wheeler–Feynman absorber theory (3,730 words) [view diff] exact match in snippet view article find links to article
electromagnetic field. Rather, the whole theory is encapsulated by the Lorentz-invariant action S {\displaystyle S} of particle trajectories a μ ( τ ) , b μ (
Principle of covariance (468 words) [view diff] exact match in snippet view article find links to article
cases the equations are actually invariant. However, in the theory of weak interactions, the equations are not invariant under reflections (but are, of
Connection form (4,630 words) [view diff] exact match in snippet view article find links to article
Christoffel symbols for the Levi-Civita connection. The main tensorial invariant of a connection form is its curvature form. In the presence of a solder
Electric potential (2,250 words) [view diff] exact match in snippet view article find links to article
per unit charge. This value can be calculated in either a static (time-invariant) or a dynamic (time-varying) electric field at a specific time with the
Component (graph theory) (3,441 words) [view diff] exact match in snippet view article
components in a given graph is an important graph invariant, and is closely related to invariants of matroids, topological spaces, and matrices. In random
P-form electrodynamics (544 words) [view diff] exact match in snippet view article find links to article
0-form and d {\displaystyle d} is the exterior derivative, and a gauge-invariant vector current J {\displaystyle \mathbf {J} } with density 1 satisfying
Line fitting (173 words) [view diff] exact match in snippet view article find links to article
scale-invariant i.e. changing the measurement units leads to a different line.) Weighted geometric distance: Deming regression Scale invariant approach:
Extremal black hole (492 words) [view diff] exact match in snippet view article find links to article
supersymmetric theories, extremal black holes are often supersymmetric: they are invariant under several supercharges. This is a consequence of the BPS bound. Such
Analytic torsion (2,129 words) [view diff] exact match in snippet view article find links to article
torsion (or R-torsion, or Reidemeister–Franz torsion) is a topological invariant of manifolds introduced by Kurt Reidemeister (Reidemeister 1935) for 3-manifolds
Line fitting (173 words) [view diff] exact match in snippet view article find links to article
scale-invariant i.e. changing the measurement units leads to a different line.) Weighted geometric distance: Deming regression Scale invariant approach:
Extremal black hole (492 words) [view diff] exact match in snippet view article find links to article
supersymmetric theories, extremal black holes are often supersymmetric: they are invariant under several supercharges. This is a consequence of the BPS bound. Such
Variant surface glycoprotein (3,689 words) [view diff] exact match in snippet view article find links to article
mammalian host from accessing the plasma membrane or any other parasitic invariant surface epitopes (such as ion channels, transporters, receptors etc.)
Electric potential (2,250 words) [view diff] exact match in snippet view article find links to article
per unit charge. This value can be calculated in either a static (time-invariant) or a dynamic (time-varying) electric field at a specific time with the
Software framework (1,552 words) [view diff] exact match in snippet view article find links to article
from scratch. A framework's default behavior can be provided with the invariant methods of the Template Method Pattern in an abstract class. Extensibility:
Lorentz group (9,875 words) [view diff] exact match in snippet view article find links to article
where gravitational variances are negligible, physical laws are Lorentz invariant in the same manner as special relativity. The Lorentz group is a subgroup
Maxwell's equations (7,991 words) [view diff] exact match in snippet view article find links to article
Einstein developed special and general relativity to accommodate the invariant speed of light, a consequence of Maxwell's equations, with the principle
Maurer–Cartan form (1,992 words) [view diff] exact match in snippet view article find links to article
algebra. If X is a left-invariant vector field on G, then ω(X) is constant on G. Furthermore, if X and Y are both left-invariant, then ω ( [ X , Y ] ) =
Relativistic dynamics (1,545 words) [view diff] exact match in snippet view article find links to article
is the use of an invariant scalar evolution parameter to monitor the historical evolution of space-time events. In a scale-invariant theory, the strength
Component (graph theory) (3,441 words) [view diff] exact match in snippet view article
components in a given graph is an important graph invariant, and is closely related to invariants of matroids, topological spaces, and matrices. In random
Igor Klebanov (1,394 words) [view diff] exact match in snippet view article find links to article
descriptions of critical phenomena, and quantum many-body scars as group invariant states. 2010 Guggenheim Fellowship 2010 Princeton University Graduate
MHC class II (2,119 words) [view diff] exact match in snippet view article find links to article
polypeptide known as the invariant chain. The nascent MHC class II protein in the rough ER has its peptide-binding cleft blocked by the invariant chain (Ii; a trimer)
Irreducible representation (2,824 words) [view diff] exact match in snippet view article find links to article
{\displaystyle G} -invariant subspaces, e.g. the whole vector space V {\displaystyle V} , and {0}). If there is a proper nontrivial invariant subspace, ρ {\displaystyle
P-form electrodynamics (544 words) [view diff] exact match in snippet view article find links to article
0-form and d {\displaystyle d} is the exterior derivative, and a gauge-invariant vector current J {\displaystyle \mathbf {J} } with density 1 satisfying
One-dimensional space (398 words) [view diff] exact match in snippet view article find links to article
⊂ V generated by the eigenvector such that T(A) = A, that is, A is an invariant set under the action of T. In Lie theory, a one-dimensional subspace of
List of topology topics (361 words) [view diff] exact match in snippet view article find links to article
considered in topology are homeomorphisms and homotopies. A property that is invariant under such deformations is a topological property. Basic examples of topological
CLIP (protein) (470 words) [view diff] exact match in snippet view article
CLIP or Class II-associated invariant chain peptide is the part of the invariant chain (Ii) that binds to the peptide binding groove of MHC class II and
Height (abelian group) (1,062 words) [view diff] exact match in snippet view article
In mathematics, the height of an element g of an abelian group A is an invariant that captures its divisibility properties: it is the largest natural number
Double-ended queue (2,281 words) [view diff] exact match in snippet view article find links to article
necessarily respect the invariant. In a second time we'll explain how to modify a deque which does not satisfy the invariant into one which satisfies
Automorphic function (515 words) [view diff] exact match in snippet view article find links to article
mathematics, an automorphic function is a function on a space that is invariant under the action of some group, in other words a function on the quotient
Analog signal processing (1,621 words) [view diff] exact match in snippet view article find links to article
signal level or other factors that cause them to be non-linear or non-time-invariant, but most are stable enough to model as LTI. Linearity and time-invariance
Rotation number (690 words) [view diff] exact match in snippet view article find links to article
In mathematics, the rotation number is an invariant of homeomorphisms of the circle. It was first defined by Henri Poincaré in 1885, in relation to the
De Rham cohomology (2,923 words) [view diff] exact match in snippet view article find links to article
manifold, and the de Rham cohomology groups comprise a set of topological invariants of smooth manifolds that precisely quantify this relationship. The integration
Fixed effects model (3,166 words) [view diff] exact match in snippet view article find links to article
coefficients in the regression model including those fixed effects (one time-invariant intercept for each subject). Such models assist in controlling for omitted
Liouville field theory (3,921 words) [view diff] exact match in snippet view article find links to article
=\alpha (Q-\alpha )\ .} The central charge and conformal dimensions are invariant under the duality b → 1 b   , {\displaystyle b\to {\frac {1}{b}}\ ,} The
S. Ramanan (641 words) [view diff] exact match in snippet view article find links to article
SS Chern and B Simons to introduce what is known as the Chern-Simons invariant, which has proved useful in theoretical physics. He is an alumnus of the
Momentum operator (2,146 words) [view diff] exact match in snippet view article find links to article
that the definition above is the canonical momentum, which is not gauge invariant and not a measurable physical quantity for charged particles in an electromagnetic
Rotation number (690 words) [view diff] exact match in snippet view article find links to article
In mathematics, the rotation number is an invariant of homeomorphisms of the circle. It was first defined by Henri Poincaré in 1885, in relation to the
Clifford Taubes (813 words) [view diff] exact match in snippet view article find links to article
Seiberg–Witten invariant is equal to an invariant which enumerates certain pseudoholomorphic curves and is now known as Taubes's Gromov invariant. This fact
Galois cohomology (1,276 words) [view diff] exact match in snippet view article find links to article
means. Galois cohomology accounts for the way in which taking Galois-invariant elements fails to be an exact functor. The current theory of Galois cohomology
Stochastic electrodynamics (1,417 words) [view diff] exact match in snippet view article find links to article
of theoretical physics by adding the hypothesis of a classical Lorentz invariant radiation field having statistical properties similar to that of the electromagnetic
Robion Kirby (435 words) [view diff] exact match in snippet view article find links to article
Together with Laurent C. Siebenmann he developed the Kirby–Siebenmann invariant for classifying the piecewise linear structures on a topological manifold
Weinberg–Witten theorem (2,566 words) [view diff] exact match in snippet view article find links to article
{\displaystyle J^{\mu }} (see four-current) which is Poincaré covariant (and gauge invariant if there happens to be any gauge symmetry which hasn't been gauge-fixed)
Von Mises yield criterion (1,912 words) [view diff] exact match in snippet view article find links to article
criterion) states that yielding of a ductile material begins when the second invariant of deviatoric stress J 2 {\displaystyle J_{2}} reaches a critical value
Aperiodic set of prototiles (1,068 words) [view diff] exact match in snippet view article find links to article
of tiles might admit periodic tilings — that is, tilings that remain invariant after being shifted by a translation (for example, a lattice of square
Dirac string (405 words) [view diff] exact match in snippet view article find links to article
to a gauge transformation. This shows that Dirac strings are not gauge invariant, which is consistent with the fact that they are not observable. The Dirac
Double-ended queue (2,281 words) [view diff] exact match in snippet view article find links to article
necessarily respect the invariant. In a second time we'll explain how to modify a deque which does not satisfy the invariant into one which satisfies
Fixed effects model (3,166 words) [view diff] exact match in snippet view article find links to article
coefficients in the regression model including those fixed effects (one time-invariant intercept for each subject). Such models assist in controlling for omitted
Characteristic function (253 words) [view diff] exact match in snippet view article find links to article
function in statistical mechanics. The Euler characteristic, a topological invariant. The receiver operating characteristic in statistical decision theory
Japanese language in EBCDIC (1,813 words) [view diff] exact match in snippet view article find links to article
In the following table, conformance to the invariant set is marked with green; collision with the invariant set is marked with red. There are three double-byte
Pseudoscalar (831 words) [view diff] exact match in snippet view article find links to article
scalar. Both are physical quantities which assume a single value which is invariant under proper rotations. However, under the parity transformation, pseudoscalars
Chain complex (2,115 words) [view diff] exact match in snippet view article find links to article
complex is called the singular homology of X, and is a commonly used invariant of a topological space. Chain complexes are studied in homological algebra
Continuous symmetry (317 words) [view diff] exact match in snippet view article find links to article
as opposed to discrete symmetry, e.g. reflection symmetry, which is invariant under a kind of flip from one state to another. However, a discrete symmetry
Exponential stability (682 words) [view diff] exact match in snippet view article find links to article
In control theory, a continuous linear time-invariant system (LTI) is exponentially stable if and only if the system has eigenvalues (i.e., the poles
Spin network (1,565 words) [view diff] exact match in snippet view article find links to article
construct a particular functional on the space of connections which is invariant under local gauge transformations. A spin network, as described in Penrose
TRPC (1,187 words) [view diff] exact match in snippet view article find links to article
ankyrin repeats near the N-terminus and a TRP box motif containing the invariant EWKFAR sequence at the proximal C-terminus. These channels are non-selectively
Extended Kalman filter (3,779 words) [view diff] exact match in snippet view article find links to article
term based on an invariant output error; in the same way the gain matrix is not updated from a linear state error, but from an invariant state error. The
Incidence algebra (3,019 words) [view diff] exact match in snippet view article find links to article
otherwise, a kind of invariant delta function on isomorphism classes of intervals. Its powers in the incidence algebra are the other invariant delta functions
Nambu–Goto action (1,703 words) [view diff] exact match in snippet view article find links to article
The Nambu–Goto action is the simplest invariant action in bosonic string theory, and is also used in other theories that investigate string-like objects
Kármán–Howarth equation (1,175 words) [view diff] exact match in snippet view article find links to article
correlation tensor can be expressed in terms of two scalar functions, using the invariant theory of full rotation group, first derived by Howard P. Robertson in
Jeffreys prior (2,591 words) [view diff] exact match in snippet view article find links to article
\right)\propto \left|I(\theta )\right|^{1/2}.\,} It has the key feature that it is invariant under a change of coordinates for the parameter vector θ {\textstyle \theta
Geoffrey Colin Shephard (218 words) [view diff] exact match in snippet view article find links to article
another problem on polyhedral nets, proved the Shephard–Todd theorem in invariant theory of finite groups, began the study of complex polytopes, and classified
Adaptive Huffman coding (1,140 words) [view diff] exact match in snippet view article find links to article
the left child, and the one with the higher value as the right child. Invariant : For each weight w, all leaves of weight w precede all internal nodes
Ramond–Ramond field (2,285 words) [view diff] exact match in snippet view article find links to article
3-form field strength the field strength defined above is no longer gauge invariant and so also needs to be defined patchwise with the Dirac string off of
Ramond–Ramond field (2,285 words) [view diff] exact match in snippet view article find links to article
3-form field strength the field strength defined above is no longer gauge invariant and so also needs to be defined patchwise with the Dirac string off of
Adaptive Huffman coding (1,140 words) [view diff] exact match in snippet view article find links to article
the left child, and the one with the higher value as the right child. Invariant : For each weight w, all leaves of weight w precede all internal nodes
Quantum fluctuation (1,020 words) [view diff] exact match in snippet view article find links to article
Lorentz-invariant (although not manifestly in the above), whereas the classical thermal state is not (the classical dynamics is Lorentz-invariant, but the
Next-to-Minimal Supersymmetric Standard Model (1,274 words) [view diff] exact match in snippet view article find links to article
MSSM is solved in the NMSSM, the superpotential of the NMSSM being scale-invariant. The role of the λ {\displaystyle \lambda } term is to generate an effective
Plücker formula (1,027 words) [view diff] exact match in snippet view article find links to article
that relate certain numeric invariants of algebraic curves to corresponding invariants of their dual curves. The invariant called the genus, common to
Class function (331 words) [view diff] exact match in snippet view article find links to article
that is constant on the conjugacy classes of G. In other words, it is invariant under the conjugation map on G. Such functions play a basic role in representation
Universality (dynamical systems) (1,440 words) [view diff] exact match in snippet view article
that only change the short-distance details. The collection of scale-invariant statistical theories define the universality classes, and the finite-dimensional
Elementary divisors (446 words) [view diff] exact match in snippet view article find links to article
associated) p to give the final invariant factor; as long as M is non-empty, repeat to find the invariant factors before it. Invariant factors Smith normal form
Ending lamination theorem (536 words) [view diff] exact match in snippet view article find links to article
fundamental groups are determined by their topology together with certain "end invariants", which are geodesic laminations on some surfaces in the boundary of the
Hyperbolic set (508 words) [view diff] exact match in snippet view article find links to article
respect to a smooth map f if its tangent bundle may be split into two invariant subbundles, one of which is contracting and the other is expanding under
Event (relativity) (406 words) [view diff] exact match in snippet view article
{\text{event space}}{\text{separation}}}\right]^{2}} is an invariant.: 9  An event in the universe is caused by the set of events in its causal
Central force (607 words) [view diff] exact match in snippet view article find links to article
conservative if and only if it is spherically symmetric or rotationally invariant.: 133–38  Examples of spherically symmetric central forces include the
Padam Chand Jain (201 words) [view diff] exact match in snippet view article find links to article
difference technique, finite element technique and quasilinearization and invariant embedding have been developed and applied to various problems in fluid
Loop-erased random walk (2,458 words) [view diff] exact match in snippet view article find links to article
conformally invariant. These arguments allowed to show that certain measurables of loop-erased random walk are (in the limit) conformally invariant, and that
Rasch model (5,234 words) [view diff] exact match in snippet view article find links to article
appear in textbooks or on tests. By requiring measures to remain the same (invariant) across different tests measuring the same thing, Rasch models make it
Exception safety (935 words) [view diff] exact match in snippet view article find links to article
breaking invariants of a mutable data structure, as follows: A step of an operation on a mutable data structure modifies the data and breaks an invariant. An
Stueckelberg action (691 words) [view diff] exact match in snippet view article find links to article
photon is, in fact, renormalizable, even though it is not manifestly gauge invariant (after the Stückelberg scalar has been eliminated in the Proca action)
Tarjan's strongly connected components algorithm (1,711 words) [view diff] exact match in snippet view article find links to article
necessarily popped from the stack when this recursive call returns. The crucial invariant property is that a node remains on the stack after it has been visited
Universality class (873 words) [view diff] exact match in snippet view article find links to article
class is a collection of mathematical models which share a single scale-invariant limit under the process of renormalization group flow. While the models
History of quantum field theory (5,644 words) [view diff] exact match in snippet view article find links to article
transformations (specifically, they showed that the field commutators were Lorentz invariant). A further boost for quantum field theory came with the discovery of
Idempotence (2,941 words) [view diff] exact match in snippet view article find links to article
Benjamin Peirce in 1870 in the context of elements of algebras that remain invariant when raised to a positive integer power, and literally means "(the quality
Hauptvermutung (788 words) [view diff] exact match in snippet view article find links to article
1967–69 (originally in the simply-connected case), using the Rochlin invariant and the cohomology group H 3 ( M ; Z / 2 Z ) {\displaystyle H^{3}(M;\mathbb
Inhibitor of apoptosis domain (327 words) [view diff] exact match in snippet view article find links to article
the zinc-finger domain family and characteristically have a number of invariant amino acid residues, including 3 conserved cysteines and one conserved
R-symmetry (125 words) [view diff] exact match in snippet view article find links to article
becomes a global U(N) non-abelian group. In a model that is classically invariant under both N=1 supersymmetry and conformal transformations, the closure
R-symmetry (125 words) [view diff] exact match in snippet view article find links to article
becomes a global U(N) non-abelian group. In a model that is classically invariant under both N=1 supersymmetry and conformal transformations, the closure
Gamma delta T cell (4,472 words) [view diff] exact match in snippet view article find links to article
to have a prominent role in lipid antigen recognition. They are of an invariant nature. They may be triggered by alarm signals such as heat shock proteins
D'Alembert operator (815 words) [view diff] exact match in snippet view article find links to article
_{22}=\eta _{33}=1} .) Lorentz transformations leave the Minkowski metric invariant, so the d'Alembertian yields a Lorentz scalar. The above coordinate expressions
Symmetric tensor (1,794 words) [view diff] exact match in snippet view article find links to article
In mathematics, a symmetric tensor is an unmixed tensor that is invariant under a permutation of its vector arguments: T ( v 1 , v 2 , … , v r ) = T (
Semantic analysis (linguistics) (314 words) [view diff] exact match in snippet view article
figurative speech, being cultural, are often also converted into relatively invariant meanings in semantic analysis. Semantics, although related to pragmatics
Tensor operator (9,007 words) [view diff] exact match in snippet view article find links to article
\mathbf {J} )^{2}.} An operator Ω ^ {\displaystyle {\widehat {\Omega }}} is invariant under a unitary transformation U if Ω ^ = U † Ω ^ U ; {\displaystyle {\widehat
Matrix representation of conic sections (3,254 words) [view diff] exact match in snippet view article find links to article
form. The trace and determinant of A 33 {\displaystyle A_{33}} are both invariant with respect to rotation of axes and translation of the plane (movement
Linear circuit (945 words) [view diff] exact match in snippet view article find links to article
A linear circuit with constant component values is called linear time-invariant (LTI). Informally, a linear circuit is one in which the electronic components'
Problem of time (2,498 words) [view diff] exact match in snippet view article find links to article
generates a conserved Weyl current according to Noether’s theorem. In scale-invariant cosmological models, this Weyl current naturally gives rise to a harmonic
Wilson loop (4,874 words) [view diff] exact match in snippet view article find links to article
In quantum field theory, Wilson loops are gauge invariant operators arising from the parallel transport of gauge variables around closed loops. They encode
Lorenz gauge condition (1,496 words) [view diff] exact match in snippet view article find links to article
given his name to many concepts in this field. The condition is Lorentz invariant. The Lorenz gauge condition does not completely determine the gauge: one
Brauer–Wall group (549 words) [view diff] exact match in snippet view article find links to article
x)(f,y) = (e + f, (−1)efxy). The map from BW(F) to Q(F) is the Clifford invariant defined by mapping an algebra to the pair consisting of its grade and
Euler's rotation theorem (4,497 words) [view diff] exact match in snippet view article find links to article
and arc AO bisects angle ∠αAa. Let us construct a point that could be invariant using the previous considerations. We start with the blue great circle
Mirror nuclei (351 words) [view diff] exact match in snippet view article find links to article
and also due to Coulomb interaction. Since the strong interaction is invariant to protons and neutrons one can expect these mirror nuclei to have very
Lüroth quartic (157 words) [view diff] no match in snippet view article find links to article
In mathematics, a Lüroth quartic is a nonsingular quartic plane curve containing the 10 vertices of a complete pentalateral. They were introduced by Jacob
CAPTCHA (3,537 words) [view diff] exact match in snippet view article find links to article
simultaneous use of three separate abilities—invariant recognition, segmentation, and parsing to complete the task. Invariant recognition refers to the ability to
Shift space (3,124 words) [view diff] exact match in snippet view article find links to article
Tychonov topology and invariant by translations. More generally one can define a shift space as the closed and translation-invariant subsets of A G {\displaystyle
Mokken scale (1,606 words) [view diff] exact match in snippet view article find links to article
remain invariant rank-ordering. There has been some confusion in Mokken scaling between the concepts of Double Monotonicity model and invariant item ordering
Pentagram map (6,298 words) [view diff] exact match in snippet view article find links to article
from the formula, to be invariant functions. All these products turn out to be Casimir invariants with respect to the invariant Poisson bracket discussed
Dirac equation (13,114 words) [view diff] exact match in snippet view article find links to article
vector, the four-momentum, and they are related by the relativistically invariant relation E 2 = m 2 c 4 + p 2 c 2 , {\displaystyle E^{2}=m^{2}c^{4}+p^{2}c^{2}
Topological index (1,221 words) [view diff] exact match in snippet view article find links to article
parameters of a graph which characterize its topology and are usually graph invariant. Topological indices are used for example in the development of quantitative
Fermionic field (1,698 words) [view diff] exact match in snippet view article find links to article
+1/2 or s = −1/2. The energy factor is the result of having a Lorentz invariant integration measure. In second quantization, ψ ( x ) {\displaystyle \psi