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About: Noncommutative ring     Goto   Sponge   NotDistinct   Permalink

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In mathematics, a noncommutative ring is a ring whose multiplication is not commutative; that is, there exist a and b in the ring such that ab and ba are different. Equivalently, a noncommutative ring is a ring that is not a commutative ring. Noncommutative algebra is the part of ring theory devoted to study of properties of the noncommutative rings, including the properties that apply also to commutative rings. Although some authors do not assume that rings have a multiplicative identity, in this article we make that assumption unless stated otherwise.