Sice you have no Meta view of the considered subject, you are missing the following:
I wish to share with you some Meta view of the Mathematical Science, which does not follow after some basic agreed notions. Let us start by using
Gottlob Frege's notion about X≠X. He defined number 0 as the amount of the objects of the class of all X≠X ( (
http://plato.stanford.edu/entries/frege/ ) )
0 is not equivalent to Nothing, because 0 is, after all something, called a number. But it does not mean that Emptiness or Nothing can't directly be used in order to do some Math. Let us follow this notion by re-examine, for example, the notion of the empty set:
(X=X) means: "X exists" or "X is true"
(X≠X) means: "X does not exist" or "X is false"