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S,T:Type. (n:, f:(nS). Bij(n; S; f)) & (n:, f:(nT). Bij(n; T; f)) (n:, f:(nST). Bij(n; ST; f))

By: RWH (LemmaC Thm* (f:(AB). Bij(A; B; f)) (A ~ B)) 0

Generated subgoal:

1 S,T:Type. (n:. n ~ S) & (n:. n ~ T) (n:. n ~ (ST))


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alluniverseimpliesandexistsfunctionnatural_number