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Noun
1. commutative ringMathematics
Wikipedia definition
2. Commutative ringIn ring theory, a branch of abstract algebra, a commutative ring is a ring in which the multiplication operation is commutative. The study of commutative rings is called commutative algebra.
Read “Commutative ring” on English Wikipedia
Read “可換環” on Japanese Wikipedia
Read “Commutative ring” on DBpedia

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