Nuprl - Proof: union functionality wrt one one corr 1 1 2

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At: union functionality wrt one one corr 1 1 2

1. A : Type
2. A' : Type
3. B : Type
4. B' : Type
5. f : A

A'
6. g : A'

A
7. InvFuns(A;A';f;g)
8. f1 : B

B'
9. g1 : B'

B
10. InvFuns(B;B';f1;g1)
11. y : B

g1(f1(y)) = y

By:	BackThru: InvFuns(B;B';f1;g1)

Generated subgoals:

None

About:

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