Question: 6.1 Let K: X X ! R be a PDS kernel, and let : X ! R be a positive function. Show that the

6.1 Let K: X  X ! R be a PDS kernel, and let : X ! R be a positive function.

Show that the kernel K0 de ned for all x; y 2 X by K0(x; y) = K(x;y)

(x) (y) is a PDS kernel.

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