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