Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.idempand

¬(¬q ∨ p) ↔ ¬¬((r ↔ (s ∨ s)) ∨ ¬s)