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The additive inverse of a number is the opposite of that number, that is, the additive inverse of a number x is -x. The sum of a number and its additive inverse is always zero, that is, x + (-x) = 0. Related Terms: addition, number, opposites, sum, zero. English | Espaol.
More formally, an additive identity of a given set equipped with addition operation is defined as an element of set, whose addition with any other element of the set gives that element itself.