Exercise logic.propositional.dnf.unicode
Description
Proposition to DNF (unicode support)
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
¬(q → p) ↔ ((¬¬(T ∧ (r ↔ s)) ∧ (r ↔ s)) ∨ ¬s)
⇒ logic.propositional.truezeroand¬(q → p) ↔ ((¬¬(r ↔ s) ∧ (r ↔ s)) ∨ ¬s)
⇒ logic.propositional.defequiv¬(q → p) ↔ ((¬¬((r ∧ s) ∨ (¬r ∧ ¬s)) ∧ (r ↔ s)) ∨ ¬s)