# Category:Definitions/Abundance

This category contains definitions related to Abundance.
Related results can be found in Category:Abundance.

Let $n \in \Z_{\ge 0}$ be a positive integer.

Let $\sigma \left({n}\right)$ be the sigma function of $n$.

That is, let $\sigma \left({n}\right)$ be the sum of all positive divisors of $n$.

Then the abundance of $n$ is defined as $A \left({n}\right) = \sigma \left({n}\right) - 2 n$.

## Subcategories

This category has the following 9 subcategories, out of 9 total.

## Pages in category "Definitions/Abundance"

The following 8 pages are in this category, out of 8 total.