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At: surj is inj gen 1 1

1. A: Type
2. B: Type
3. f: AB
4. f1: AB
5. g: BA
6. InvFuns(A; B; f1; g)
7. n:
8. f:(nB). Bij(n; B; f)
9. Surj(A; B; f)

Inj(A; B; f)

By: RWH (LemmaC Thm* (f:(AB). Bij(A; B; f)) (A ~ B)) 8

Generated subgoal:

18. n ~ B
9. Surj(A; B; f)
Inj(A; B; f)


About:
universefunctionexistsnatural_number