(After Renee Descartes, French philosper and mathematician) The Cartesian product of two sets A and B is the setA x B = .I.e. the product set contains all possible combinations of one element from each set.The idea can be extended to products of any number of sets.If we consider the elements in sets A and B as points along perpendicular axes in a two-dimensional space then the elements of the product are the "Cartesian coordinates" of points in that space.See also tuple.(1995-03-01)