Lyubeznik's invariants for cohomologically isolated singularities

被引:15
作者
Blickle, Manuel [1 ]
机构
[1] Univ Essen Gesamthsch, FB6 Math, D-45117 Essen, Germany
关键词
local cohomology; characteristic p; perverse sheaves;
D O I
10.1016/j.jalgebra.2006.06.029
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
In this note I give a description of Lyubeznik's local cohomology invariants for a certain natural class of local rings, namely the ones which have the same local cohomology vanishing as one expects from an isolated singularity. This strengthens our results of [Manuel Blickle, Raphael Bondu, Local cohomology multiplicities in terms of etale cohomology, Ann. Inst. Fourier 55 (7) (2005)] while at the same time somewhat simplifying the proofs. Through examples I further point out the bad behavior of these invariants under reduction mod p. (c) 2006 Published by Elsevier Inc.
引用
收藏
页码:118 / 123
页数:6
相关论文
共 9 条
[1]  
BEILINSON AA, 1982, ANAL TOPOLOGY SINGUL, V1, P5
[2]  
BLICKLE M, 2005, ANN I FOURIER, V55
[3]  
BOREL A, 1984, PROGR MATH, V50
[4]  
EMERTON M, 2004, GEOMETRIC ASPECTS DW, V1, P677
[5]  
Emerton M., 2004, GEOMETRIC ASPECTS DW, P677
[6]  
Emerton Matthew, 2004, ASTERISQUE, V293, pvi+257
[7]   BASS NUMBERS OF LOCAL COHOMOLOGY MODULES [J].
HUNEKE, CL ;
SHARP, RY .
TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY, 1993, 339 (02) :765-779
[8]  
Lpez R. Garcia, 1998, COLLECT MATH, V49, P317
[9]   FINITENESS PROPERTIES OF LOCAL COHOMOLOGY MODULES (AN APPLICATION OF D-MODULES TO COMMUTATIVE ALGEBRA) [J].
LYUBEZNIK, G .
INVENTIONES MATHEMATICAE, 1993, 113 (01) :41-55