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出典:Wiktionary
empty product (複数形 empty products)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/14 19:46 UTC 版)
In mathematics, an empty product, or nullary product, is the result of multiplying no factors. It is equal to the multiplicative identity 1, given that it exists for the multiplication operation in question, just as the empty sum—the result of adding no numbers—is zero, or the additive identity.
empty product