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