If f is a ch.f., then show that / is positive definite; i.e., for all tk, t1

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If f is a ch.f., then show that / is positive definite; i.e., for all tk, t1 reals and all complex numbers zk, z1, we have
If f is a ch.f., then show that / is

for every integer n ‰¥ 1.

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