Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.defimpl

¬(q → p) ↔ (¬s ∨ (r ∧ s) ∨ (¬r ∧ ¬s))