Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.notnot

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