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Omni-MATH / Find all functions f:Q→Q such thatf(x)+f(t)=f(y)+f(z)for all rational numbers x<y<z<t that form an arithmetic progression. (Q is the set of all rational numbers.) · Discussion

Discussing Find all functions f:Q→Q such thatf(x)+f(t)=f(y)+f(z)for all rational numbers x<y<z<t that form an arithmetic progression. (Q is the set of all rational numbers.) · Omni-MATH

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