Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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