R-module
(algebra) The monoid action of a ring R on an abelian group.
A watch that displays time by means of a dial and hands, in contradistinction to a digital watch.
Any of various tooth shells of the genus Dentalium.
plural of rule-book
ノーター環 R 上の有限生成加群の任意の部分加群も有限生成である。
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