Concept
Index set
Overview
In mathematics, an index set is a set whose members label (or index) members of another set. For instance, if the elements of a set A may be indexed or labeled by means of the elements of a set J, then J is an index set. The indexing consists of a surjective function from J onto A, and the indexed collection is typically called an indexed family, often written as {Aj}j∈J.
Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).
Related ideas
Place in the tradition
Part of Outline of logic.