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Omni-MATH / Determine all functions f:R²→R for which f(A)+f(B)+f(C)+f(D)=0,whenever A,B,C,D are the vertices of a square with side-length one. · Discussion

Discussing Determine all functions f:R²→R for which f(A)+f(B)+f(C)+f(D)=0,whenever A,B,C,D are the vertices of a square with side-length one. · Omni-MATH

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