# Category:Empty Class

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This category contains results about the empty class.

A class is defined as being **empty** if and only if it has no elements.

That is:

- $\forall x: x \notin A$

or:

- $\neg \exists x: x \in A$

The **empty class** is usually denoted $\O$ or $\emptyset$.

## Pages in category "Empty Class"

The following 5 pages are in this category, out of 5 total.