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SE-SKOLORNAS 2020 Problem 3

    Determine all bounded functions f:R→Rf: R \to R , such that f(f(x)+y)=f(x)+f(y)f (f (x) + y) = f (x) + f (y) , for all real x,yx, y .

    Dataset text AI-MO AoPS. Quoted with source.

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