| Definition: | for any element of a set in which an addition with a neutral element is defined, the unique element of the set, if it exists, such that the sum of the two elements is the neutral element NOTE 1 In English, the term "negative" applies in particular to numbers and matrices, whereas the term "opposite" is used for vectors and tensors. NOTE 2 The negative of element a is denoted by −a, and inversely.
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