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奇异正交群作用下子空间轨道的长度
引用本文:李晓琴.奇异正交群作用下子空间轨道的长度[J].郑州大学学报(自然科学版),2013(4):13-18.
作者姓名:李晓琴
作者单位:甘肃民族师范学院数学系,甘肃合作747000
基金项目:国家自然科学基金资助项目,编号11161042.
摘    要:设Fq是q个元素的有限域,Fq2v+δ+l是Fq上2v+δ+l维行向量空间,O2v+δ+l,△(Fq)和O2v+δ+l(Fq)分别是奇特征和偶特征有限域Fq上的正交群.Fq2v+δ+l在02v+B+l,z(F。)(02v+8+l(F。))作用下导出了它在Fq2v+δ+l子空间集合上的作用,因而Fq2v+δ+l在0:州+f.d(F。)(0:。+:(F,))作用下划分成一些轨道M(m,2sy,s,F,k;2v+占,△)(Mm,2s+y,s,,k;2v+6+z)).采用正交群0:Ⅲ,。(F。)(02v+8+1(‘))作用在F2。。上子空间轨道长度的公式,并且利用矩阵初等行变换的方法,分别给出M(m,2s+7,s,F,k;2v+6,△)和M(m,2s+y,s,F,k;2v+6+1)的长度公式.

关 键 词:子空间  轨道  有限域  奇异正交群  行向量空间

Length of Subspace Orbits under the Actions of Singular Orthogonal Groups
LI Xiao-qin.Length of Subspace Orbits under the Actions of Singular Orthogonal Groups[J].Journal of Zhengzhou University (Natural Science),2013(4):13-18.
Authors:LI Xiao-qin
Institution:LI Xiao-qin (Department of Mathematics, Gansu Normal University for Nationalities, Hezuo 747000, China)
Abstract:Let Fq be a finite field of q elements, let F2qz+z be a 2v +8 + l dimensional row vector space over Fq, and 02+8+l,,(Fq) and 02+al(Fq) be orthogonal groups over the finite fields Fq of Ch. 52 and C h. = 2, respectively. The actions of the set of subspaces of F2q +8 +l was introduced by F 8 +l under the action of 02v +8+t, (Fq) ( 02+8+t (Fq) ), and this set F +8+z was partitioned into some orbits M( m ,2s +T,s,F,k;2v +8,A ) (M(m,2s +),,s,F,k;2v +8 +l) ). The formulae of length of M(m,2s +T,s,F, k;2v +8,A) (M(m,2s +T,s,F,k;2v +8 + l) ) were given by the formulae of the length of subspaces or- bits under the action of 02+, (Fq) (02v+8+t( Fq ) ) and elementary row transformations in matrix.
Keywords:subspace  orbit  finite field  singular orthogonal group  row vector
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