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) /\ ~p) || ((~p || q) /\ r) => p -> (q /\ r)
⇒ absorpand-subset, initial=TList [TCon logic1.or [TCon logic1.and [TCon logic1.or [TCon logic1.not [TVar "p"],TVar "q"],TCon logic1.not [TVar "p"]],TCon logic1.and [TCon logic1.or [TCon logic1.not [TVar "p"],TVar "q"],TVar "r"]]]~p || ((~p || q) /\ r) => p -> (q /\ r)