Exercise logic.propositional.dnf

Description
Proposition to DNF

Derivation

Final term is not finished

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

⇒ logic.propositional.notnot

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.demorganor

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

⇒ logic.propositional.absorpand

~(~q /\ ~r)