<*mathematics, programming*> 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".

Last updated: 2006-10-12

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Copyright Denis Howe 1985