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.idempor

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