Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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