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Am reading about Reproducing Kernel Hilbert Space(RKHS) while reading through Functional Analysis and Hilbert Space material and am unable to get the notation :

$k(ยท,xi)$ correctly. What does the dot '.' signify? $k$ is a p.s.d kernel and $xi$ is a point in real space. I have a background in linear algebra, statistics and advanced calculus.

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