| Definition: | for any element a of a set in which a multiplication with a neutral element u is defined, the unique element a−1 of the set, if it exists, such that a⋅a−1=a−1⋅a=u Note 1 to entry: In English, the term "reciprocal" is preferred for numbers. Note 2 to entry: The inverse of element a is denoted by a−1. For a non-zero number, or for a quantity or unit, the inverse may also be denoted by 1/a or 1a.
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