Invalid Argument/Examples/Moon is Yellow

Example of Invalid Argument
This argument is invalid:


 * The moon is yellow.
 * Therefore, the moon is made of cheese.

Proof
Let $P$ denote the simple statement The moon is yellow..

Let $Q$ denote the simple statement The moon is made of cheese..

The argument can then be expressed as:

There is nothing connecting the two statements.

Hence this is not a valid argument form.