Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.defimpl

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