Level: Lib Thy Top: 2
Hypotheses:

  1. A :

  2. R : A List A List

  3. EquivRel(A List;x,y.x R y)

  4. x,y,z:A List. x R y (z @ x) R (z @ y)

  5. g : x,y:(A List)//(x R y)

  6. L : L(A)

  7. l : A List

Conclusion:

L A List

Applied Tactic: (Unfold `languages` 6 ...)
Generated subgoals:

None