Let f a continuous function defined on R such that ∀x,y∈R:f(x+y)=f(x)+f(y)
Prove that :∃a∈R,∀x∈R,f(x)=ax
I have injection f:A→B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...
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