Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

~~q || ~~~~(p -> q) || p

⇒ logic.propositional.notnot

~~q || ~~(p -> q) || p

⇒ logic.propositional.notnot

~~q || (p -> q) || p

⇒ logic.propositional.defimpl

~~q || ~p || q || p