Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.truezeroand

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

⇒ logic.propositional.defimpl

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