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