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Omni-MATH / Find all functions f:mathbb Ztomathbb Z, satisfy that for any integer a, b, c, 2f(a²+b²+c²)−2f(ab+bc+ca)=f(a−b)²+f(b−c)²+f(c−a)² · Discussion
Discussing Find all functions f:mathbb {Z}tomathbb Z, satisfy that for any integer a, b, c, 2f(a²+b²+c²)−2f(ab+bc+ca)=f(a−b)²+f(b−c)²+f(c−a)² · Omni-MATH
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