Cartesian product

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The Cartesian product of two sets A and B is the set (usually denoted by A × B) consisting of all ordered pairs (a, b) where and . The Cartesian product is named after René Descartes, who invented this concept.

A common example of a Cartesian product is the coordinate plane, . This is all ordered pairs (a,b) of real numbers a and b. It is used for graphing functions on the real numbers.

See also