Exercise logic.propositional.consequence
Description
Prove that formula is a logical consequence of a set of formulas
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
(~p /\ (q -> r)) || (q /\ (~q || r)) => p -> r
⇒ fakeabsorption(~p /\ (q -> r)) || (q /\ r) => p -> r
Description
Prove that formula is a logical consequence of a set of formulas