Nuprl - Proof: fun with inv is bij 1 1 2

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At: fun with inv is bij 1 1 2

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

B
4. g : B

A
5. g o f = Id
6. f o g = Id
7. b : B

a:A. f(a) = b

By:	Witness g(b)

Generated subgoal:

1 f(g(b)) = b
3 steps

About:

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