Reduced right ideals which are strongly essential in direct summands (Q1097945)

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scientific article; zbMATH DE number 4036020
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English
Reduced right ideals which are strongly essential in direct summands
scientific article; zbMATH DE number 4036020

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    Reduced right ideals which are strongly essential in direct summands (English)
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    1989
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    Let R denote an associative ring with unity and X and Y are right ideals of R. We say X is strongly essential in Y if Y is an essential extension of X and X is an essential extension of an isomorphic copy of Y. R is said to be right GFC if every faithful cyclic right R-module generates Mod-R. In this paper we show that if R satisfies any of the following conditions, then every finitely generated reduced (i.e., no nonzero nilpotent elements) right ideal is strongly essential in a direct summand of R: (i) every finitely generated reduced right ideal is essential in a direct summand of R; (ii) R is right p.p. right GFC, (iii) R is semiprime quasi-Baer right GFC. Examples of such rings are: regular rings, right CS rings, and semiprime right FPF rings.
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    strongly essential
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    essential extension
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    faithful cyclic right R-module
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    finitely generated reduced right ideal
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    direct summand
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    right p.p. right GFC
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    semiprime quasi-Baer right GFC
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    right CS rings
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    semiprime right FPF rings
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