1. −1 (number)In mathematics, −1 is the additive inverse of 1, that is, the number that when added to 1 gives the additive identity element, 0. It is the negative integer greater than negative two (−2) and less than 0. Negative one has some similar but slightly different properties to positive one. Negative one bears relation to Euler's identity since In computer science, −1 is a common initial value for integers and is also used to show that a variable contains no useful information.
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Read “−1 (number)” on English Wikipedia
Read “−1” on Japanese Wikipedia
Read “−1 (number)” on DBpedia
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