Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.idempor

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