Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

(¬(¬q ∨ p) ↔ (¬s ∨ (r ↔ s))) ∨ F

⇒ logic.propositional.defequiv

(¬(¬q ∨ p) ↔ (¬s ∨ (r ∧ s) ∨ (¬r ∧ ¬s))) ∨ F