Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

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

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.idempor

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.absorpor

q || r