Level: Lib Thy Top:
Hypotheses:None
Conclusion:
Alph:
. L,M,N:L(Alph). (L 
(M N)) = ((L M) N)
Applied Tactic: Unfold `languages` 0 THEN
Unfold `lang_eq` 0 THEN
Unfold `lang_inters` 0 THEN
UnivCD THENW Auto THEN
Reduce 0 THEN
ProveProp THEN
Auto
Generated subgoals: