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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク perfect ring ： ウィキペディア英語版 perfect ring In the area of abstract algebra known as ring theory, a left perfect ring is a type of ring in which all left modules have projective covers. The right case is defined by analogy, and the condition is not left-right symmetric, that is, there exist rings which are perfect on one side but not the other. Perfect rings were introduced in . A semiperfect ring is a ring over which every finitely generated left module has a projective cover. This property is left-right symmetric. ==Perfect ring== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「perfect ring」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.