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