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математика
нулевое произведение
математика
пустое произведение
общая лексика
пустой указатель
в программировании - ссылка на ноль. Такое значение указателя может, означать неудачный результат работы функции. Это значение часто присваивается указателю в качестве начального или значения по умолчанию
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In mathematics, an empty product, or nullary product or vacuous product, is the result of multiplying no factors. It is by convention equal to the multiplicative identity (assuming there is an identity for the multiplication operation in question), just as the empty sum—the result of adding no numbers—is by convention zero, or the additive identity. When numbers are implied, the empty product becomes one.
The term empty product is most often used in the above sense when discussing arithmetic operations. However, the term is sometimes employed when discussing set-theoretic intersections, categorical products, and products in computer programming; these are discussed below.