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.idempand(~(q -> r) /\ ~(q -> r)) || q || r
⇒ logic.propositional.defimpl(~(~q || r) /\ ~(q -> r)) || q || r