Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

¬(q → ¬¬p) ↔ (¬¬¬¬(r ↔ s) ∨ ¬s)

⇒ logic.propositional.notnot

¬(q → ¬¬p) ↔ (¬¬(r ↔ s) ∨ ¬s)

⇒ logic.propositional.defequiv

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