2001
DOI: 10.7146/math.scand.a-14338
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Koszul property for points in projective spaces

Abstract: A graded K-algebra R is said to be Koszul if the minimal R-free graded resolution of K is linear. In this paper we study the Koszul property of the homogeneous coordinate ring R of a set of s points in the complex projective space P n . Kempf proved that R is Koszul if s ≤ 2n and the points are in general linear position. If the coordinates of the points are algebraically independent over Q, then we prove that R is Koszul if and only if s ≤ 1 + n + n 2 /4. If s ≤ 2n and the points are in linear general positio… Show more

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Cited by 53 publications
(96 citation statements)
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“…If c = 0, then by rescaling t 1 we may assume c = 1. Using the weight ω (8) (see Table 4), one gets that in ω (8) (8) (I) is the Koszul algebra (10) in Table 2, S/I is Koszul too. If c = 0, then we may assume after rescaling t 1 that a = 1.…”
Section: The Rank Of Q Ismentioning
confidence: 99%
“…If c = 0, then by rescaling t 1 we may assume c = 1. Using the weight ω (8) (see Table 4), one gets that in ω (8) (8) (I) is the Koszul algebra (10) in Table 2, S/I is Koszul too. If c = 0, then we may assume after rescaling t 1 that a = 1.…”
Section: The Rank Of Q Ismentioning
confidence: 99%
“…Коммутативные алгебры с аналогичными свойствами (так называемые алгебры c козюлевыми фильтрациями) изучались в ряде работ [1][2][3][4][5][6]. Здесь рассматри-вается некоммутативная версия этого понятия.…”
Section: Introductionunclassified
“…Это понятие введено и изучено в ряде статей Конки и др. [1,2,4]. Показано, в частности, что многие квадратичные алгебры, естественным образом возникающие в алгебра-ической геометрии (такие, как координатные кольца канонических вложений общих проективных кривых и проективных вложений абелевых многообразий), содержат козюлевы фильтрации.…”
Section: Introductionunclassified
“…One of them is the concept of Koszul filtration. This notion, introduced in [6], was inspired by the work of Herzog, Hibi and Restuccia ( [9]) on strongly Koszul algebras. Let us first recall the standard definition of Koszul filtration.…”
Section: Koszul Modulesmentioning
confidence: 99%
“…One of them is the existence of a special filtration called Koszul filtration which is introduced by Conca, Trung and Valla ( [6]). Roughly speaking, a Koszul filtration for an algebra R is a family of ideals of R generated by linear forms such that any ideal of the family can be filtered in such a way that all the successive colon ideals belong to the family.…”
Section: Introductionmentioning
confidence: 99%