Let , then for any operator ,
is called the Pincherle derivative of . If is a shift-invariant operator, then its Pincherle derivative is also a shift-invariant operator.
Let , then for any operator ,
is called the Pincherle derivative of . If is a shift-invariant operator, then its Pincherle derivative is also a shift-invariant operator.
Weisstein, Eric W. "Pincherle Derivative." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PincherleDerivative.html