Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

(p || q) /\ ~~(r <-> p)

⇒ logic.propositional.notnot

(p || q) /\ (r <-> p)

⇒ logic.propositional.defequiv

(p || q) /\ ((r /\ p) || (~r /\ ~p))