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$\begingroup$ Good to know the French word as well. Every language adapted the same equivalent of "core". In case of integral equations, could you elaborate a little bit more on the original use of kernel there? How is the multiplying function of two variables serves as a "core" in the integrand. I am a chemist (the word kernel intrigued me during noise analysis). $\endgroup$
– ACR
Commented Apr 29, 2019 at 18:41
2

$\begingroup$ @M.Farooq Keep in mind that this is just my guess, Fredholm does not say anything. In an integral equation you have a term $\int K(x,y)f(y)\,dy$, with $K$ tucked inside, like a core, and it stays the same for all solutions $f$. $\endgroup$
– Conifold
Commented Apr 29, 2019 at 21:05

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