The function in an integral or integral transform
Whittaker and Robinson (1967, p. 376) use the term nucleus for kernel.
The function in an integral or integral transform
Whittaker and Robinson (1967, p. 376) use the term nucleus for kernel.
Weisstein, Eric W. "Integral Kernel." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/IntegralKernel.html