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At: lang auto compute 1 1 2 1 2 2 2 1 1

1. Alph: Type
2. L: LangOver(Alph)
3. EquivRel x,y:Alph*. x L-induced Equiv y
4. L Alph*Prop
5. g: (x,y:Alph*//(x L-induced Equiv y))
6. l: Alph*
7. u: Alph
8. v: Alph*
9. (Result(A(g))v) = v x,y:Alph*//(x L-induced Equiv y)
10. u.v = nil
11. z1: Alph*
12. z2: Alph*
13. z1 L-induced Equiv z2

(u.z1) L-induced Equiv (u.z2)

By:
Unfold `lang_rel` 0
THEN
Reduce 0


Generated subgoal:

1 z:Alph*. L(z @ (u.z1)) L(z @ (u.z2))


About:
consuniverselistmemberfunctionprop
quotientboolequalnilallapply