Category:Definitions/Abundance
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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 $\map {\sigma_1} n$ be the divisor sum function of $n$.
That is, let $\map {\sigma_1} n$ be the sum of all positive divisors of $n$.
Then the abundance of $n$ is defined as $\map A n = \map {\sigma_1} n - 2 n$.
Subcategories
This category has the following 9 subcategories, out of 9 total.
Pages in category "Definitions/Abundance"
The following 10 pages are in this category, out of 10 total.