Question: 6.7 De ne a di erence kernel as K(x; x0) = jx ???? x0j for x; x0 2 R. Show that this kernel is not

6.7 De ne a di erence kernel as K(x; x0) = jx ???? x0j for x; x0 2 R. Show that this kernel is not positive de nite symmetric (PDS).

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