Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.idempor

¬(¬q ∨ p) ↔ ((¬¬r ↔ s) ∨ ¬(s ∧ s))