Question: For y(si - s;) to be a valid semivariogram for a spatial process Z(s), it must be conditionally negative-definite, i.e., m m ECaia;(si - 8;)

For y(si - s;) to be a valid semivariogram for a spatial process Z(s), it must be conditionally negative-definite, i.e., m m ECaia;(si - 8;) 50, i=1 j=1 for any number of sites si, . . . , Sm and real numbers a1, . . . , am with )fai = 0. Why is that
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