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product An expression in mathematics or computer programming consisting of two other expressions multiplied together. In mathematics, multiplication is usually represented by {juxtaposition}, e.g. "x y", whereas in programming, "*" is used as an infix operator, e.g. "salary * tax_rate. In the most common type of product, each operand is a number (integer, real number, {fraction} or {imaginary number}) but the term extends naturally to cover more complex operations like multiplying a string by an integer (e.g., in Perl, "foo" x 2) or multiplying vectors and {matrices} or more than two operands. In {type systems}, a tuple is sometimes known as a "product type". (2006-10-12)
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