Exercise relationalgebra.cnf
Description
To conjunctive normal form
Derivation
(r ; (s /\ s) \/ s) /\ (r ; (s /\ s) \/ q ! I)
⇒ relationalgebra.idempotencyand(r ; s \/ s) /\ (r ; (s /\ s) \/ q ! I)
⇒ relationalgebra.idempotencyand(r ; s \/ s) /\ (r ; s \/ q ! I)