Exercise logic.propositional.dnf.unicode
Description
Proposition to DNF (unicode support)
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
(¬(q → p) ∨ ¬((q → p) ∧ (q → p))) ↔ (¬¬(r ↔ s) ∨ ¬s)
⇒ logic.propositional.idempand(¬(q → p) ∨ ¬(q → p)) ↔ (¬¬(r ↔ s) ∨ ¬s)
⇒ logic.propositional.defimpl(¬(q → p) ∨ ¬(¬q ∨ p)) ↔ (¬¬(r ↔ s) ∨ ¬s)