One thing i never really understand is why kernel trick is called 'kernel'.

Kernel means:

the central or most important part of something.

synonyms: essence, core, heart, essentials, quintessence, fundamentals, basics, nub, gist, substance;

what's the connection between above definition and 'make low dimension samples repeatable in high dimension'?

does anyone have any insights here?

marked as duplicate by Michael Chernick, kjetil b halvorsen, John, gung, Peter Flom Mar 27 '17 at 10:01

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