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At: surj is inj gen 1 1 1 1 2 1 1 1 1 1 1 1 1 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. f2: nB
9. g1: Bn
10. g1 o f2 = Id
11. f2 o g1 = Id
12. Surj(A; B; f)
13. a1: A
14. a2: A
15. f(a1) = f(a2)

g1(f(g(f1(a1)))) = g1(f(g(f1(a2))))
By: Analyze 6
Generated subgoal:

16. g o f1 = Id
7. f1 o g = Id
8. n:
9. f2: nB
10. g1: Bn
11. g1 o f2 = Id
12. f2 o g1 = Id
13. Surj(A; B; f)
14. a1: A
15. a2: A
16. f(a1) = f(a2)
g1(f(g(f1(a1)))) = g1(f(g(f1(a2))))

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equalnatural_numberapplyuniversefunction