taylorgallien7380 taylorgallien7380
  • 12-03-2024
  • Mathematics
contestada

Let a be a set, and suppose there exists a surjection f : n → a.
Define g : a → n by letting g(a) be the smallest element of the set f⁻¹({a}).
Prove that f ◦ g = ia, and prove that g is an injection.

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