Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.notnot

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