Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

r || ~(~q || r) || q || r

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.absorpor

r || q || r