Level: Lib Thy Top: 1 1
Hypotheses:

  1. Alph :

  2. L : Alph List

  3. R : Alph List Alph List

  4. EquivRel(Alph List;x,y.x R y)

  5. x,y,z:Alph List. x R y (z @ x) R (z @ y)

  6. g : x,y:(Alph List)//(x R y)

  7. l:Alph List. L l (g l)

  8. x : Alph List

  9. y : Alph List

Conclusion:

L L(Alph)

Applied Tactic: (Unfold `languages` 0 ...)
Generated subgoals:

None