Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.idempand

¬(¬(q ∨ q) ∨ p) ↔ ((r ↔ s) ∨ ¬s)