Question: Continuing Problem 7, let f(l) be a function on the nonnegative integers, and define a function gk(l) = f(k + l) f(k) for every

Continuing Problem 7, let f(l) be a function on the nonnegative integers, and define a function gk(l) = f(k + l) − f(k) for every integer k ≥ 0.

Show that f(l) is concave if and only if each gk(l) is subadditive.

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