Torsion pairs and related modules over trivial ring extensions

Abstract

Let $R\ltimes M$ be a trivial extension of a ring $R$ by an $R$-$R$-bimodule $M$. We first study how to construct torsion pairs over $R\ltimes M$ from torsion pairs over $R$. Some characterizations of finitely generated (presented) modules, flat modules and coherent rings relative to a torsion pair over $R\ltimes M$ are obtained. Then we discuss the transfers of torsion pairs over $R\ltimes M$ to $R$. Finally, some applications are given in Morita context rings.

Keywords

• torsion pair
• trivial ring extension
• Morita context ring

Supporting Institution

NSFC

Project Number

12171230, 12271249

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