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偏周期预投射代数的Hilbert级数

Hilbert Series of Partial Period Preprojective Algebra

【作者】 吴春生

【导师】 郭晋云;

【作者基本信息】 湖南师范大学 , 基础数学, 2007, 硕士

【摘要】 设△是一个有限无圈的箭图。本文引入了由△所决定的偏周期预投射代数的概念,它是一个定义在周期为p的稳定平移箭图Z△/(τp)上的代数,记为ПQ(△,p),J。当周期p=1时,偏周期预投射代数就是偏预投射代数,因此偏周期预投射代数是偏预投射代数的推广,偏预投射代数是偏周期预投射代数的特殊情况。利用分次代数自由积的Hilbert级数的性质我们刻划了星形箭图的偏周期预投射代数的Hilbert级数并给出了其计算公式,并在此基础上讨论了白点集非空时的无圈的连通箭图△所决定的偏周期预投射代数П(Q(△,p)),J的Hilbert级数并给出了其计算公式hПQ(△,p),J(t)=1/1-Ct+DJt2,其中C,DJ均为pn×pn阶方阵,而A是星形箭图的邻接矩阵,A′是A的转置,p为偏周期预投射的周期。

【Abstract】 Let△be a finite quiver without cycle. This paper introduces the concept of par-tial period preprojective algebra defined over△, which is a algebra defined on stabletranslation quiver Z△/(τP) of period p, denoted by∏(Q(△, p)),J. when p=1, partialperiod preprojective algebra is just partial preprojective algebra, so partial periodpreprojective algebra is a generalization of partial preprojective algebra, partial pre-projective algebra is special case of partial period preprojective algebra. In thispaper we discribe Hilbert series of a partial period preprojective algebra over a starshaped quiver and we obtain a formula by graded algebra free product. Then wediscuss the Hilbert series of partial period preprojective algebra∏(Q(△,p)),J decidedby a noempty white vertex set and obtain the formula hQ(△, p),J(t)=1/(1-Ct+DJt2),for it, where C and DJ are pn matrices,A is the adjacent matrix of star shaped quiver, A’ is the transpose of A, p is periodof partial period preprojective algebra.

  • 【分类号】O153
  • 【下载频次】26
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