Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.defimpl

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