Nuprl - Proof: one one corr rel vs invfuns 1 2 1 1 2

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At: one one corr rel vs invfuns 1 2 1 1 2

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

Prop
4. f : A

B
5. g : B

A
6.

x:A. g(f(x)) = x
7.

y:B. f(g(y)) = y
8.

x:A, y:B. R(x;y)

y = f(x) & x = g(y)
9. x : A
10. y : B
11. R(x;y)

y = f(x)

By:	Rewrite-1 by Hyp:8

Generated subgoals:

None

About:

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