Let $R$ be a commutative ring and $U$ an $R$-module. The aim of this paper is to study the duality between $U$-reflexive (pre)envelopes and $U$-reflexive (pre)covers of $R$-modules.
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机译:假设$ R $是交换环,而$ U $是$ R $模块。本文的目的是研究$ R $自反(预)信封与$ R $自反(预)封皮$ R $模块之间的对偶性。
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