Nuprl - Proof: inv funs iff inv funs 2 1 1 1 2 1

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At: inv funs iff inv funs 2 1 1 1 2 1

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

B
4. g : B

A
5.

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

(g o f)(x) = Id(x)

By:	Compute (g o f)(x) = Id(x) * g(f(x)) = x A THEN BackThru: Hyp:5

Generated subgoals:

None

About:

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html