Nuprl - Proof: fun with inv2 is surj

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At: fun with inv2 is surj

A,B:Type, f:(A

B), g:(B

A). InvFuns(A;B;f;g)

Surj(A; B; f)

By:	Def of InvFuns(A;B;f;g)

Generated subgoal:

1 1. A : Type
2. B : Type
3. f : AB
4. g : BA
5. x:A. g(f(x)) = x
6. y:B. f(g(y)) = y
Surj(A; B; f)
3 steps

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