If k∈R is fixed, find all f:R→R that satisfy f(f(x))=k for all real x.
If k≥0, f(x)=|k+g(x)−g(|x|)| is a solution for any g:R→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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