Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.notnot

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