Covariance function – link to Definiteness

It is not possible to add the new link because it would replace an existing, longer link.

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	:<math>C(x,y)=C_s(y-x).\,</math>		:<math>C(x,y)=C_s(y-x).\,</math>

	The [[~~Positive-definite function\|positive~~ definiteness]] of this single-argument version of the covariance function can be checked by [[Bochner's theorem]].<ref name="Cressie"/>		The positive [[definiteness]] of this single-argument version of the covariance function can be checked by [[Bochner's theorem]].<ref name="Cressie"/>