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At: mn 23 lem 1 1

1. Alph: Type
2. R: Alph*Alph*Prop
3. Fin(Alph)
4. EquivRel x,y:Alph*. x R y
5. Fin(x,y:Alph*//(x R y))
6. x,y,z:Alph*. (x R y) ((z @ x) R (z @ y))
7. g: (x,y:Alph*//(x R y))

Fin((x,y:Alph*//(x R y))(x,y:Alph*//(x R y)))

By: Inst Thm* t:T. Fin(T) Fin(TT) [x,y:Alph*//(x R y);nil]

Generated subgoal:

1 nil x,y:Alph*//(x R y)


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