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At: one2one preserves fin 1 1 1 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. f1: nT
9. Bij(n; T; f1)

f:(nU). Bij(n; U; f)
By: Witness f o f1
Generated subgoal:

1 Bij(n; U; f o f1)

About:
existsfunctionnatural_numberuniverseequal