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At: lang inters assoc


Alph:Type, L,M,N:LangOver(Alph). (L (M N)) = ((L M) N)

By:
Unfold `languages` 0
THEN
Unfold `lang_eq` 0
THEN
Unfold `lang_inters` 0
THEN
UnivCD
THEN
Reduce 0
THEN
ProveProp


Generated subgoals:

None


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