# Category:Definitions/One

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This category contains definitions related to One.

The cardinal associated with the singleton $\left\{{\varnothing}\right\}$ is called **one**, and is denoted $1$.

More informally, this means that **one** is defined as being **the number of elements in a singleton set**.

## Pages in category "Definitions/One"

The following 3 pages are in this category, out of 3 total.