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GeezerVison is showing mathworld.wolfram.com — Index Set -- from Wolfram MathWorld

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Index Set

An index set is a set whose members index (label) members of another set. For example, in the set A= union _(k in K)A_k, the set K is an index set of the set A.

See also

Family, Index, Multi-Index Notation, Set

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Cite this as:

Weisstein, Eric W. "Index Set." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/IndexSet.html

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