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