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This page is about Index of Matrix Element. For other uses, see index.


Let $\mathbf A$ be an $m \times n$ matrix.

Let $a_{i j}$ be the element in row $i$ and column $j$ of $\mathbf A$.

Then the subscripts $i$ and $j$ are referred to as the indices (singular: index) of $a_{i j}$.

Linguistic Note

The plural of index is indices.

Compare vertex and apex, which have a similar plural form.