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斜体 (数学)
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Wikipedia definition
1. Division ring​In abstract algebra, a division ring, also called a skew field, is a ring in which division is possible. Specifically, it is a non-trivial ring in which every non-zero element a has a multiplicative inverse, i.e. , an element x with {{{1}}}. Stated differently, a ring is a division ring if and only if the group of units is the set of all non-zero elements. Division rings differ from fields only in that their multiplication is not required to be commutative.
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