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

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

1. k :

2. f :

k inj

k
3. f

k
4. Inj(

k; f)
5. b :

k
6.

(

k. f(a) = b)

False

By:	(k inj {y:k\| y = b }) Asserted

Generated subgoals:

1 (k inj {y:k| y = b })
8 steps

2 7. (k inj {y:k| y = b })
False
2 steps

About:

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1	(k inj {y:k\| y = b })	8 steps
2	7. (k inj {y:k\| y = b }) False	2 steps