Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.absorpor

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

⇒ logic.propositional.defimpl

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