At: mn 23 lem 1 1 1 1 3
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))
8. x: x,y:Alph*//(x R y)
9. y: x,y:Alph*//(x R y)
10. Dec(x@0:Alph*. (
z.g(z@
x) = g(z@y))(x@0))
Dec(z:Alph*. g(z@x) = g(z@y))
By: Reduce -1
Generated subgoals:None
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