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