Nuprl - Proof: bij imp exists inv2 1 1

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At: bij imp exists inv2 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.

a:A. f(a) = b

b:B.

!a:A. f(a) = b

By:	SimilarTo: Hyp:5

Generated subgoal:

1 5. b : B
6. a : A
7. f(a) = b
a is the a:A. f(a) = b
2 steps

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