Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.absorpor

~~(r || q)