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