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At: one2one preserves fin 1 1 1 1 1 1
1. T: Type
2. U: Type
3. f: TU
4. g: UT
5. g o f = Id
6. f o g = Id
7. n:
8. f:(nT). Bij(n; T; f)

Fin(U)
By: Analyze 8
Generated subgoal:

18. f1: nT
9. Bij(n; T; f1)
Fin(U)

About:
universefunctionequalexistsnatural_number