Exercise logic.propositional.cnf.unicode

Description
Proposition to CNF (unicode support)

Derivation

Final term is not finished

¬(¬¬T ∧ ¬¬r ∧ (r ↔ r))

⇒ logic.propositional.notnot

¬(T ∧ ¬¬r ∧ (r ↔ r))