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, SetExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Index Set." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/IndexSet.html