Nuprl - Proof: fun with inv2 is inj 1 1 1

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At: fun with inv2 is inj 1 1 1

1. A : Type
2. B : Type
3. f : A

B
4. g : B

A
5.

x:A. g(f(x)) = x
6.

y:B. f(g(y)) = y
7. a1 : A
8. a2 : A
9. f(a1) = f(a2)
10. g(f(a1)) = g(f(a2))

a1 = a2

By:	Rewrite-1 by Hyp:5

Generated subgoals:

None

About:

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