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At: mn 23 refinment 1
1. Alph: Type
2. L: LangOver(Alph)
3. R: Alph*Alph*Prop
4. EquivRel x,y:Alph*. x R y
5. g: (x,y:Alph*//(x R y))
6. l:Alph*. L(l) g(l)
7. x,y,z:Alph*. (x R y) ((z @ x) R (z @ y))
8. x: Alph*
9. y: Alph*
10. x R y

x L-induced Equiv y
By:
Unfold `lang_rel` 0
THEN
Reduce 0
Generated subgoal:

1 z:Alph*. L(z @ x) L(z @ y)

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