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At: surj is inj 1 2

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

a1 = a2

By: Assert (h:(n(n+1)). Surj(n; (n+1); h))

Generated subgoals:

1 h:(n(n+1)). Surj(n; (n+1); h)
28. h:(n(n+1)). Surj(n; (n+1); h)
a1 = a2


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