Nuprl - Proof: bij imp exists inv2 1 1 1 1

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At: bij imp exists inv2 1 1 1 1

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

B
4.

a1,a2:A. f(a1) = f(a2)

a1 = a2
5. b : B
6. a : A
7. f(a) = b
8. a' : A
9. f(a') = b

a' = a

By:	BackThru: Hyp:4

Generated subgoals:

None

About:

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