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searching for Wick's theorem 3 found (87 total)

Schur product theorem (1,664 words) [view diff] exact match in snippet view article find links to article

X_{i}^{2}\right\rangle \left\langle X_{j}^{2}\right\rangle } Using Wick's theorem to develop ⟨ X i 2 X j 2 ⟩ = 2 ⟨ X i X j ⟩ 2 + ⟨ X i 2 ⟩ ⟨ X j 2 ⟩ {\displaystyle

Thermal quantum field theory (1,170 words) [view diff] exact match in snippet view article find links to article

University Press. ISBN 978-0-19-850923-3. T.S. Evans and D.A. Steer (1996). "Wick's theorem at finite temperature". Nucl. Phys. B. 474 (2): 481–496. arXiv:hep-ph/9601268

Ising model (19,672 words) [view diff] exact match in snippet view article find links to article

other correlation functions at long distances are then determined by Wick's theorem. All the odd moments are zero, by ± symmetry. The even moments are the