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arXiv · 2610.37878

Width and amplitude inequalities over DG-rings

Luigi Ferraro·Zachary Nason
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Abstract

We study width over commutative noetherian local differential graded (DG) rings with bounded homology. We establish a derived width formula and prove amplitude inequalities for the derived completion of derived Hom and tensor products. As applications, we obtain Iversen's amplitude inequality and a criterion ensuring that regular sequences on a DG-module are regular on the DG-ring. These applications recover results for DG-modules with finitely generated homology and also hold for derived complete DG-modules. Finally, we characterize Cohen--Macaulay DG-rings by the existence of a bounded derived complete DG-module of finite injective dimension whose amplitude equals that of the DG-ring. This provides a version of Bass' conjecture for derived complete DG-modules.

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Luigi Ferraro, Zachary Nason. 2026-10-27. Width and amplitude inequalities over DG-rings. https://arxiv.org/abs/2610.37878

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