Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

~(q -> r) || ((q -> r) -> q) || r

⇒ logic.propositional.defimpl

~(q -> r) || ~(q -> r) || q || r

⇒ logic.propositional.defimpl

~(q -> r) || ~(~q || r) || q || r

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.absorpor

~(q -> r) || q || r