# Definition:Index

Jump to navigation
Jump to search

## Disambiguation

This page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

**Index** may refer to:

- Set Theory:
- Index: an element of an indexing set

- Matrix Theory:
- Index of Matrix Element: one of the two parameters which specifies an element of a matrix

- Algebra and Analysis:
- Power (Algebra): the $y$ term in expressions such as $x^y$, also known as the exponent of $x$
- Index variable: the dummy variable $j$ in the summation $\displaystyle \sum_{j \mathop = 1}^n a_j$

- Statistics:
- Index: A figure used to show the variation in a quantity over a period of time.