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There are two main meanings of index (plural indices)::

One meaning is power or exponent. 2 is the index in the expression 62.

The second meaning comes from sequences or related sets of numbers. Rather than give each element a different identifier (or name) it is simpler to give them all the same name but with a variable index. So for example, a sequence of numbers may be named U1, U2, U3, ... or, in general, Un. In such a case, n is the index.

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12y ago

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