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