Question: Exercise 4.2.5: Suppose f: R > R is a function such that I f (x) f(y)| S Ix yl2 for all x and y. Show

Exercise 4.2.5: Suppose f: R > R is a function such that I f (x) f(y)| S Ix yl2 for all x and y. Show that f (x) : C for some constant C. Hint: Show that f is dijferentiable at all points and compute the derivative

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