Exercise relationalgebra.cnf
Description
To conjunctive normal form
Derivation
(V- ; s)- \/ (V- ; (s /\ q))- /\ s-
⇒ relationalgebra.remredunexprs(V- ; s)- \/ V-- /\ s-
⇒ relationalgebra.doublenegation(V- ; s)- \/ V /\ s-
⇒ relationalgebra.remredunexprs(V- ; s)- \/ s-