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At: one2one preserves fin 1 1 1 1 1 1 1 1 1 1 1 1 1 2
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. Inj(n; T; f1)
10. Surj(n; T; f1)

Surj(n; U; f o f1)
By: Unfold `surject` 0
Generated subgoal:

1 b:U. a:n. (f o f1)(a) = b

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natural_numberuniversefunctionequalallexistsapply