Exercise relationalgebra.cnf

Description
To conjunctive normal form

Derivation

r ; (s /\ s) \/ s /\ q ! I

⇒ relationalgebra.idempotencyand

r ; s \/ s /\ q ! I

⇒ relationalgebra.unionoverintersec

(r ; s \/ s) /\ (r ; s \/ q ! I)