Exercise logic.propositional.cnf.unicode
Description
Proposition to CNF (unicode support)
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
¬(¬¬T ∧ r ∧ (r ↔ (T ∧ r)))
⇒ logic.propositional.notnot¬(T ∧ r ∧ (r ↔ (T ∧ r)))
⇒ logic.propositional.truezeroand¬(r ∧ (r ↔ (T ∧ r)))
⇒ logic.propositional.truezeroand¬(r ∧ (r ↔ r))
⇒ logic.propositional.defequiv¬(r ∧ ((r ∧ r) ∨ (¬r ∧ ¬r)))
⇒ logic.propositional.idempand¬(r ∧ (r ∨ (¬r ∧ ¬r)))
⇒ logic.propositional.absorpand¬r