Dominant local rings and subcategory classification

R Takahashi - International Mathematics Research Notices, 2023 - academic.oup.com
We introduce a new notion of commutative noetherian local rings, which we call dominant.
We explore fundamental properties of dominant local rings and compare them with other …

Some characterizations of local rings via reducing dimensions

O Celikbas, S Dey, T Kobayashi, H Matsui - arXiv preprint arXiv …, 2022 - arxiv.org
In this paper we study homological dimensions of finitely generated modules over
commutative Noetherian local rings, called reducing homological dimensions. We obtain …

Almost Gorenstein rings arising from fiber products

N Endo, S Goto, R Isobe - Canadian Mathematical Bulletin, 2021 - cambridge.org
The purpose of this paper is, as part of the stratification of Cohen–Macaulay rings, to
investigate the question of when the fiber products are almost Gorenstein rings. We show …

Minimal free resolutions of fiber products

H Geller - Proceedings of the American Mathematical Society, 2022 - ams.org
We consider a local (or standard graded) ring $ R $ with ideals $\mathcal {I}'$, $\mathcal {I}
$, $\mathcal {J}'$, and $\mathcal {J} $ satisfying certain Tor-vanishing constraints. We …

Gluing of analytic space germs, invariants and Watanabe's conjecture

TH de Freitas, VHJ Pérez, AJ Miranda - Israel Journal of Mathematics, 2021 - Springer
This paper deals with the subject of singularities of a germ of an analytic space given by the
gluing of germs of complex analytic spaces and some invariants such as degree of a finite …

On Betti numbers of the gluing of germs of formal complex spaces

TH Freitas, VHJ Pérez… - Mathematische …, 2023 - Wiley Online Library
In this paper, we show that the gluing of germs of formal complex spaces is also a formal
complex space. Moreover, we study the Betti numbers of the gluing of formal complex …

Ulrich split rings

H Dao, S Dey, M Dutta - arXiv preprint arXiv:2210.03872, 2022 - arxiv.org
A local Cohen--Macaulay ring is called Ulrich-split if any short exact sequence of Ulrich
modules split. In this paper we initiate the study of Ulrich split rings. We prove several …

Semidualizing modules over numerical semigroup rings

E Celikbas, H Geller, T Kobayashi - arXiv preprint arXiv:2306.14989, 2023 - arxiv.org
A semidualizing module is a generalization of Grothendieck's dualizing module. For a local
Cohen-Macaulay ring $ R $, the ring itself and its canonical module are always realized as …

Lower bounds for Betti numbers over fiber product rings

TH Freitas, VH Jorge Pérez - Communications in Algebra, 2023 - Taylor & Francis
In this paper we study the behavior of the Betti numbers of a finitely generated R-module
over the fiber product ring R× TS, with R, S and T being local rings with common residual …

Bounds for multiplicities of the graded fiber product ring

TH Freitas, VH Jorge-Pérez - Bulletin of the Brazilian Mathematical Society …, 2022 - Springer
Bounds for Multiplicities of the Graded Fiber Product Ring | Bulletin of the Brazilian Mathematical
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