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At: surj is inj 1 2 1 1 1 1

1. n:
2. f: nn
3. Surj(n; n; f)
4. a1: n
5. a2: n
6. f(a1) = f(a2)
7. a1 = a2
8. b: (n+1)
9. b = n (n+1)

a:n. if a2=a n else f(a) fi = b (n+1)

By:
Witness a2
THEN
SplitOnConclITE


Generated subgoals:

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existsnatural_numberequaladdifthenelseapplyfunction