If Socrates is not a philosopher, then Aristotle is not a philosopher. Either something is an illusion or nothing is an illusion. There exists a tree that is not an oak. If everyone is wise, then no one is a fool. At least one nonphysical thing exists given that God exists.
Nothing is evil, unless something is good.
If nothing is mortal, then nothing is human. Some but not all paintings are forgeries. Something is not physical if and only if not everything is physical. Using the methods discussed in Section 9.2, demonstrate that the following arguments are invalid. 2 object universe can be used to demonstrate invalidity.