Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.notnot

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