Nuprl - Proof: nsub discr range surj 1 2 1

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At: nsub discr range surj 1 2 1

1. A : Type
2. A Discrete
3. k :

4. f :

A
5. {a:A|

k. a = f(i) }

Type
6. f

{a:A|

k. a = f(i) }
7. b : {a:A|

k. a = f(i) }

k. f(a) = b

By:

Analyze-1

Generated subgoal:

1 7. b : A
8. i:k. b = f(i) [not for witness]
a:k. f(a) = b {a:A| i:k. a = f(i) A }
10 steps

About:

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