Nuprl - Proof: nsub inj exteq nsub surj 1 1 1 1 1 1 1 1 1 2

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At: nsub inj exteq nsub surj 1 1 1 1 1 1 1 1 1 2

1. k :

2. f :

k inj

k
3. f

k
4. Inj(

k; f)
5. b :

k
6.

(

k. f(a) = b)
7. f

{y:

y = b }

Inj(

k; {y:

y = b }; f)

By:

Def

Generated subgoal:

1 8. a1 : k
9. a2 : k
10. f(a1) = f(a2)
a1 = a2
1 step

About:

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