Nuprl - Proof: nsub inj exteq nsub surj 1 1 1 1 1

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At: nsub inj exteq nsub surj 1 1 1 1 1

1. k :

2. f :

k inj

k
3. f

k
4. Inj(

k; f)

k. f(a) = b

By:	(b:k. (a:k. f(a) = b)) Asserted

Generated subgoals:

1 (b:k. (a:k. f(a) = b))
12 steps

2 5. (b:k. (a:k. f(a) = b))
b:k. a:k. f(a) = b
3 steps

About:

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1	(b:k. (a:k. f(a) = b))	12 steps
2	5. (b:k. (a:k. f(a) = b)) b:k. a:k. f(a) = b	3 steps