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