Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.defimpl

~~(~(~q || r || ~q || r) || q || r)

⇒ logic.propositional.idempor

~~(~(~q || r) || q || r)