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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))
8. x: x,y:Alph*//(x R y)
9. y: x,y:Alph*//(x R y)

Dec(x Rg y)
By:
Unfold `lquo_rel` 0
THEN
Reduce 0
Generated subgoal:

1 Dec(z:Alph*. g(z@x) g(z@y))

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