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At: surj is inj gen 1

1. A: Type
2. B: Type
3. f: AB
4. (f:(AB), g:(BA). InvFuns(A; B; f; g)) & (n:, f:(nB). Bij(n; B; f))
5. Surj(A; B; f)

Inj(A; B; f)

By:
Analyze 4
THEN
Analyze 4
THEN
Analyze 6
THEN
Analyze 5


Generated subgoal:

14. 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)


About:
universefunctionandexistsnatural_number