English

Cotilting sheaves over weighted noncommutative regular projective curves

Representation Theory 2020-09-28 v2 Algebraic Geometry Category Theory

Abstract

We consider the category QcohX\operatorname{Qcoh}\mathbb{X} of quasicoherent sheaves where X\mathbb{X} is a weighted noncommutative regular projective curve over a field kk. This category is a hereditary, locally noetherian Grothendieck category. We classify all indecomposable pure-injective sheaves and all cotilting sheaves of slope \infty. In the cases of nonnegative orbifold Euler characteristic this leads to a classification of pure-injective indecomposable sheaves and a description of all large cotilting sheaves in QcohX\operatorname{Qcoh}\mathbb{X}.

Keywords

Cite

@article{arxiv.1911.02485,
  title  = {Cotilting sheaves over weighted noncommutative regular projective curves},
  author = {Dirk Kussin and Rosanna Laking},
  journal= {arXiv preprint arXiv:1911.02485},
  year   = {2020}
}

Comments

28 pages, 1 figure. v2: Some typos and formulations fixed, abstract slightly changed, extended number 6.12, additional references, more streamlined recapitulation of the geometric setting

R2 v1 2026-06-23T12:07:37.363Z