Matches in DBpedia 2015-10 for { ?s ?p "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 (Bass 1960).A semiperfect ring is a ring over which every finitely generated left module has a projective cover. This property is left-right symmetric."@en }
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- Perfect_ring abstract "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 (Bass 1960).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 comment "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 (Bass 1960).A semiperfect ring is a ring over which every finitely generated left module has a projective cover. This property is left-right symmetric.".