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