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arXiv 0905.4457math.QAmath.CO
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仿射$C$ Temperley-Lieb代数的一种图解表示

A diagrammatic representation of an affine $C$ Temperley--Lieb algebra

Dana C. Ernst

摘要:

在这篇论文中,我提出了一个结合图代数,它是一个特定的Temperley-Lieb代数的仿射型$C$,它具有一个基索引的完全交换元素的Coxeter群的相同类型的忠实表示。仿射型$C$的Coxeter群包含无限个完全交换元,因此相应的Temperley-Lieb代数是无限秩的.除仿射型$A$外,所有其它具有已知图表示的广义Temperley-Lieb代数都是有限秩的.在有限秩的情况下,计数参数被用来证明忠实性,但这些技术在仿射$C$的情况下是不可用的。为了证明忠实性,我分类的完全交换元素在考克斯特群的类型$B$和仿射$C$是不可约下弱星约。这些不可约元的分类为用来证明忠实性的归纳论证提供了基础。对$B$型弱星不可约元的分类也验证了C.K. Fan关于$B$型Coxeter群中完全交换元的集合没有生成元出现在可分别左消去或右消去的左下降集或右下降集的未证明的命题.本文的结果将被用来构造仿射$C$型Hecke代数上的迹,然后用它以非递归的方式计算某些Kazhdan-Lusztig多项式的首项系数.

英文摘要:

In this thesis, I present an associative diagram algebra that is a faithful representation of a particular Temperley--Lieb algebra of type affine $C$, which has a basis indexed by the fully commutative elements of the Coxeter group of the same type. The Coxeter group of type affine $C$ contains an infinite number of fully commutative elements, and so the corresponding Temperley--Lieb algebra is of infinite rank. With the exception of type affine $A$, all other generalized Temperley--Lieb algebras with known diagrammatic representations are of finite rank. In the finite rank case, counting arguments are employed to prove faithfulness, but these techniques are not available in the affine $C$ case. To prove faithfulness, I classify the fully commutative elements in Coxeter groups of types $B$ and affine $C$ that are irreducible under weak star reductions. The classification of these irreducible elements provides the groundwork for inductive arguments that are used to prove faithfulness. The classification of the weak star irreducible elements of type $B$ also verifies C.K. Fan's unproved claim about about the set of fully commutative elements in a Coxeter group of type $B$ having no generator appearing in the left or right descent set that can be left or right cancelled, respectively. The results of this thesis will be used to construct a trace on the Hecke algebra of type affine $C$, which will then be used to compute leading coefficients of certain Kazhdan--Lusztig polynomials in a non-recursive way.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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