Nuprl - Proof: inv pair inv 1 2

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At: inv pair inv 1 2

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

fg.fg/f,g. <f,g,(

x.*),(

y.*)>)

(A ~ B)

(

fga.fga/f,#. #/g,a. <f,g>)

(A ~ B)

By:	Analyze THEN Analyze-1 THEN New:[g \| a] Analyze-1 THEN Reduce Concl

Generated subgoal:

1 4. f : AB
5. g : BA
6. InvFuns(A;B;f;g)
<f,g> AB
2 steps

About:

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