A set whose members index (label) members of another set. For example, in the set , the set is an index set of the set .

# Index Set

## See also

Family, Index, Multi-Index Notation, Set## Explore with Wolfram|Alpha

## Cite this as:

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