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