In mathematics, a family, or indexed family, is a collection of objects, each associated with an element, known as an index, that belongs to some index set. For example, a family of real numbers, indexed by the set of integers, is a collection of real numbers, where a given function selects one real number for each integer (possibly the same) as indexing.
In mathematics, a family, or indexed family, is a collection of objects, each associated with an element, known as an index, that belongs to some index set. For example, a family of real numbers, indexed by the set of integers, is a collection of real numbers, where a given function selects one real number for each integer (possibly the same) as indexing.
Source: Wikipedia "Indexed family" · CC BY-SA 4.0
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