Give a function
f: Rβ(0;+β) continous on R and such that
f(x+y) = f(x).f(y)
a. Prove f(0) = 1
b. Let h(x) = ln[f(x)]. Prove that:
h(x+y) = h(x) + h(y)
c. Find all the function f such that problem request
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