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Cartesian Product

Definition: The Cartesian product of two sets A and B (also called the product set, set direct product, or cross product) is defined to be the set of all points (a,b) where a in A and b in B. It is denoted AxB, and is called the Cartesian product since it originated in Descartes' formulation of analytic geometry. In the Cartesian view, points in the plane are specified by their vertical and horizontal coordinates, with points on a line being specified by just one coordinate. The main examples of direct products are Euclidean threespace (RxRxR, where R are the real numbers), and the plane (RxR).
Source: http://mathworld.wolfram.com/CartesianProduct.html

Listed under: Set Theory, Field Of Topology
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