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At: finite decidable subset 1 1 2

1. T: Type
2. B: TProp
3. n:
4. f:(nT). Bij(n; T; f)
5. t:T. Dec(B(t))
6. m:. m ~ {t:T| B(t) }

Fin({t:T| B(t) })

By: Unfold `finite` 0

Generated subgoal:

1 n:, f:(n{t:T| B(t) }). Bij(n; {t:T| B(t) }; f)


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