It seems the term 'kernel' pops up all over the place and has different meanings everywhere. Is there a unifying feature to all things called 'kernel' in math that would better help me understand what a kernel is "in spirit" ?
Thanks!
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1Kernel = set of all elements mapped to unit or neutral element by some homomorphism between algebraic structures. – DonAntonio Jan 05 '14 at 22:42
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@DonAntonio : There are also "kernels" of integral transforms. That's quite a different meaning of the word. – Michael Hardy Jan 06 '14 at 01:12
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True, @MichaelHardy: Fejer's, Dirichlet's...Well, let us hope the OP figures all this out by himself...later. – DonAntonio Jan 06 '14 at 04:49