Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

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

⇒ logic.propositional.defimpl

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

⇒ logic.propositional.defequiv

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