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

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

1. k :

2. f :

k onto

k
3. f

k
4. Surj(

k; f)
5. X :

k
6. a :

k
7. f(X) = f(a)
8.

X = a
9.

({x:

x = X } onto

False

By:	Rewrite-1 by Thm* k:, j:k. {i:k\| i = j } ~ (k-1)

Generated subgoal:

1 10. ((k-1) onto k)
False
1 step

About:

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