Level: Lib Thy Top:
Hypotheses:

None

Conclusion:

T:. eq:{T}. L,M:T List. x:T. x(eq) (L @ M) x(eq) (M @ L)

Applied Tactic: UnivCD THENA Auto THEN Equivalence 2 THEN Repeat (D 0 THENA Auto)
Generated subgoals:

1. x(eq) (M @ L)

2. x(eq) (L @ M)