Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.notnot

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