English

A sub-functor for Ext and Cohen-Macaulay associated graded modules with bounded multiplicity-II

Commutative Algebra 2023-06-14 v1

Abstract

Let (A,m)(A,\mathfrak{m}) be a \CM\ local ring, then notion of TT-split sequence was introduced in part-1 of this paper for m\mathfrak{m}-adic filtration with the help of numerical function eATe^T_A. We have explored the relation between AR-sequences and TT-split sequences. For a Gorenstein ring (A,m)(A,\mathfrak{m}) we define a Hom-finite Krull-Remak-Schmidt category DA\mathcal{D}_A as a quotient of the stable category \CMS(A)\CMS(A). This category preserves isomorphism, i.e. MNM\cong N in DA\mathcal{D}_A if and only if MNM\cong N in \CMS(A)\CMS(A).This article has two objectives; first objective is to extend the notion of TT-split sequence, and second objective is to explore function eATe^T_A and TT-split sequence. When (A,m)(A,\mathfrak{m}) be an \anram\ \CM\ local ring and II be an m\mathfrak{m}-primary ideal then we extend the techniques in part-1 of this paper to the integral closure filtration with respect to II and prove a version of Brauer-Thrall-II for a class of such rings.

Keywords

Cite

@article{arxiv.2306.07361,
  title  = {A sub-functor for Ext and Cohen-Macaulay associated graded modules with bounded multiplicity-II},
  author = {Ankit Mishra and Tony J. Puthenpurakal},
  journal= {arXiv preprint arXiv:2306.07361},
  year   = {2023}
}