- #1
songoku
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Homework Statement
Consider a real valued function f which satisfies the equation f (x+y) = f (x) . f (y) for all real numbers x and y. Prove:
f ((x + y) / 2) ≤ 1/2 (f(x) + f(y))
Homework Equations
Not sure
The Attempt at a Solution
Please give me a hint to start solving this question. I have found that f (x) = (f (x/2))2 but I don't know what to do next.
Thanks