Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.defimpl

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