Exercise logic.propositional.dnf
Description
Proposition to DNF
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
~((q || F || q || F) -> r) || q || r
⇒ logic.propositional.falsezeroor~((q || q || F) -> r) || q || r
⇒ logic.propositional.falsezeroor~((q || q) -> r) || q || r
⇒ logic.propositional.idempor~(q -> r) || q || r