Essential dimension of algebraic tori
Essential dimension of algebraic tori
复制标题
代数环面的基本维数
DOI:
10.1515/crelle.2012.010
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发表时间:
2009
影响因子:
0.7
通讯作者:
Z. Reichstein
中科院分区:
文献类型:
--
作者:
R. Lötscher;M. MacDonald;A. Meyer;Z. Reichstein
Abstract The essential dimension is a numerical invariant of an algebraic group G which may be thought of as a measure of complexity of G-torsors over fields. A recent theorem of N. Karpenko and A. Merkurjev gives a simple formula for the essential dimension of a finite p-group. We obtain similar formulas for the essential p-dimension of a broad class of groups, which includes all algebraic tori.