Let f:R→R a derivable function but not
zero, such that f′(0)=2 and f(x+y)=f(x)⋅ f(y)for all
x and y belongs R. Find f.
My first answer is f(x)=e2x, and I proved that there are not more functions like f(x)=abx by Existence-Unity Theorem (ODE), but I don't know if I finished.
What do you think about this sketch of proof's idea?
Thanks,
I'll be asking more things.
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