Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

¬(¬q ∨ p) ↔ ((¬(¬r ∧ ¬r) ↔ s) ∨ ¬s)

⇒ logic.propositional.idempand

¬(¬q ∨ p) ↔ ((¬¬r ↔ s) ∨ ¬s)