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