Let g:R→R be a function which is not identically zero and which satisfies the equation
g(x+y)=g(x)g(y)for all x,y∈R.
Show that g(x)>0 for all x∈R.
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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