Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished
(¬(F ∨ (q → (p ∨ p))) ∨ F) ↔ ((r ↔ s) ∨ ¬s)
logic.propositional.idempor
(¬(F ∨ (q → p)) ∨ F) ↔ ((r ↔ s) ∨ ¬s)