👉 In mathematics, "hillman" is a mathematical function that represents the derivative of a function with respect to x. It is named after the American mathematician and astronomer Henry Poincaré, who developed it in 1920. The formula for the derivative of a function f(x) with respect to x is: f'(x) = lim h->0 [f(x+h)-f(x)] / h This equation states that the slope (or rate of change)