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Function as parameter in Wolfram Mathematica
I want to define some basic functions known from "discrete analysis":
$$I(f)(x):=f(x)$$
$$E(f)(x):=f(x+1)$$
$$\Delta(f)(x) := (E-I)(f)(x) = f(x+1)-f(x)$$
$$\nabla(f)(x) := (I-E^{-1})(f)(x) = ...
