Definition:Index

Disambiguation

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Index may refer to:

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

• Sequences:
  • Index: the index of a term $x_k$ of a sequence $\sequence {x_n}$ is $k$

• Group Theory:
  • Index: order of coset space

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

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

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