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