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Author SHA1 Message Date
Salvo 'LtWorf' Tomaselli 3b3888e9be New optimization 
Turns
        π a,b,c(A) ∪ π a,b,c(B)

    into
        π a,b,c(A ∪ B)

    if A and B are union compatible

Works with union, intersection and difference.
 2016-01-03 10:07:23 +07:00