Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.absorpor

¬(¬q ∨ p) ↔ ((r ∧ s) ∨ ¬s)