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Ordered Pair

An ordered pair is a pair of objects in which the order of the objects is significant and is used to distinguish the pair. An example is the ordered pair (a,b) which is notably different than the pair (b,a) unless the values of each variable are equivalent. Coordinates on a graph are represented by an ordered pair, x and y. In computer science, ordered pairs of scalars are also called two-dimensional vectors. In an ordered pair, the initial variable is called the "first entry" and the following, the "second entry" of the pair.

Source : DeepAI.org