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arXiv · 2607.24178

The proper stable module category of a group algebra

Georgios Dalezios·Juan Omar Gómez
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Abstract

We introduce the proper stable module category for an arbitrary discrete group over any commutative ring by means of cotorsion pairs and abelian model structures. This category is a well-generated tensor-triangulated category and is compactly generated in case the commutative ring is regular. Our construction resembles the topological approach via proper equivariant stable homotopy theory. Moreover, it agrees with the Mazza-Symonds stable module category, whenever the latter is defined, and with various other stable categories associated to hierarchically defined groups. Along the way, we introduce certain homological dimensions and study them in detail, comparing them with the classical notions.

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Georgios Dalezios, Juan Omar Gómez. 2026-07-27. The proper stable module category of a group algebra. https://arxiv.org/abs/2607.24178

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