Nuprl - Proof: one one corr fams sym 1 1 1 3 1

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At: one one corr fams sym 1 1 1 3 1

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

Type
4. B' : A'

Type
5. f : A

A'
6. g : A'

A
7. F : x:A

B(x)

B'(f(x))
8. G : x:A

B'(f(x))

B(x)
9. InvFuns(A;A';f;g)
10.

u:A. InvFuns(B(u);B'(f(u));F(u);G(u))
11. G o g

x':A'

B'(x')

B(g(x'))
12. F o g

x':A'

B(g(x'))

B'(x')

InvFuns(A';A;g;f)

By:	BackThru: Thm* InvFuns(A;B;f;g) InvFuns(B;A;g;f)

Generated subgoals:

None

About:

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