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Omni-MATH / How many functions f:1,2,3,4,5→1,2,3,4,5 satisfy f(f(x))=f(x) for all x∈1,2,3,4,5? · Discussion

Discussing How many functions f:{1,2,3,4,5}→{1,2,3,4,5} satisfy f(f(x))=f(x) for all x∈{1,2,3,4,5}? · Omni-MATH

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