Free Resolutions for deformations of maximal Cohen-Macaulay modules

L O'Carroll, D Popescu - Communications in Algebra, 2000 - Taylor & Francis
Let K be a field and sets of indetorminates, and f∈ k [[x]] g∈ k [[Y]] two non-zero formal
power series with f∈(x) g∈(Y). Set and suppose that δg is a (y)-primary ideal (eg, if char K …

Steps in the Classification of Cohen–Macaulay Modules Over Singularities of Type xt+ y3

V Ene, D Popescu - Algebras and Representation Theory, 1999 - Springer
Let k be an algebraically closed field of characteristic≠ 3 and i, j, t some positive integers
such that 1≤ i< j< t, i+ j≠ t. Then there exist a finite number of nonisomorphic …

Support Varieties and cohomology of Verdier quotients of stable category of complete intersection rings

TJ Puthenpurakal - arXiv preprint arXiv:2108.00204, 2021 - arxiv.org
Let $(A,\mathfrak {m}) $ be a complete intersection with $ k= A/\mathfrak {m} $ algebraically
closed. Let CMS (A) be the stable category of maximal CM $ A $-modules. For a large class …

Syzygy Theorems via comparison of order ideals on a hypersurface

P Griffith, A Seceleanu - Journal of Pure and Applied Algebra, 2012 - Elsevier
We introduce a weak order ideal property that suffices for establishing the Evans–Griffith
Syzygy Theorem. We study this weak order ideal property in settings that allow for …

Induced formal deformations and the Cohen-Macaulay property

P Griffith - Transactions of the American Mathematical Society, 2001 - ams.org
The main result states: if $ A/B $ is a module finite extension of excellent local normal
domains which is unramified in codimension two and if $ S/\varkappa S\simeq\hat B …

A family of cohen-macaulay modules over singularities of type xt + y3

G Pfister, D Popescu - Communications in Algebra, 1999 - Taylor & Francis
Let K be a field with char K≠ 3 and it two positive integers such that 1≤ i< t/2, t≠ 3i. The
classification problem for maximal Cohen-Macaulay modules over K [[X, Y]]/(Xt+ Y3) is …

Infinitesimal module deformations in the Thom-Sebastiani Problem

F Enescu, G Pfister, D Popescu - Archiv der Mathematik, 1997 - Springer
Let S be the formal power series ring over a field of characteristic ≠3 in n variables, f≠0 an
element from the maximal ideal of S, R= S/f, R'=SY/(f+Y^3),̃R=RY/(Y^2).¶ There exist an" …

Homological dimensions and semidualizing complexes

AA Gerko - Journal of Mathematical Sciences, 2007 - Springer
For finite modules over a local ring and complexes with finitely generated homology, we
consider several homological invariants sharing some basic properties with projective …

[HTML][HTML] Deformation theory of Cohen-Macaulay approximation

R Ile - Journal of Algebra, 2021 - Elsevier
In [22] we established axiomatic parametrised Cohen-Macaulay approximation which in
particular was applied to pairs consisting of a finite type flat family of Cohen-Macaulay rings …

مروری بر حدس اوسلَندر-رَیتن و برخی حدس‌های مرتبط با آن

اشراقی - فرهنگ و اندیشه ریاضی, 2023‎ - mct.iranjournals.ir
در این مقاله به بررسی برخی از مهم‌ترین حدس‌های هومولوژیک و ارتباط ایجابی بین آن‌ها می‌پردازیم.
چارچوب مورد استفاده برای طرح این حدس‌ها جبرهای متناهی‌بُعد روی یک میدان است. حدس اوسلَندر …