Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.absorpor

~~q || r

⇒ logic.propositional.notnot

q || r