# Who needs who ?

Organic
The ZF Axiom of the Empty set:

There is a set A such that, given any set B, B is not a member of A.

(An analogy: There is a "collector" A with no "content" B)

By using at least two variables (in this case A and B) we need some formula to describe the relations between them.

No set can be separated from the property of its content, therefore
we have an interesting situation here.

On one hand a collector can exist with no content, but on the other hand its property is depended on the property of its content.

But we also know that the content concept can't exist without a collector.

To define the exact definition of an existing thing A(a collector), is not in the same level as defining the existence of B(a content).

So A can exist with no clear property, but B can't exist at all without A.

Can someone show how Math language deals with these distinguished two levels.

If we say "There is a collector" , do you think that we can come to the conclusion that it has no content (the minimal collector's existence) as its property ?

Thank you.

Organic

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