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At: Rl iff Rg 1

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

(x L-induced Equiv y) (x Rg y)

By:
Unfolds [`lang_rel`;`lquo_rel`] 0
THEN
Unfold `mn_quo_append` 0
THEN
Reduce 0


Generated subgoal:

1 (z:A*. L(z @ x) L(z @ y)) (z:A*. g(z @ x) g(z @ y))


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