Exercise logic.propositional.dnf
Description
Proposition to DNF
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
(T /\ ~(~q || r) /\ T) || q || r
⇒ logic.propositional.truezeroand(~(~q || r) /\ T) || q || r
⇒ logic.propositional.truezeroand~(~q || r) || q || r
⇒ logic.propositional.demorganor(~~q /\ ~r) || q || r
⇒ logic.propositional.notnot(q /\ ~r) || q || r