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A semigroup approach to wreath-product extensionsof Solomon's descent algebras

机译:Solomon下降代数的花圈乘积扩展的半群方法

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摘要

There is a well-known combinatorial model, based on ordered set partitions, ofthe semigroup of faces of the braid arrangement. We generalize this model to obtaina semigroup FnG associated with G ?5,, the wreath product of the symmetric group5, with an arbitrary group G. Techniques of Bidigare and Brown are adapted toconstruct an anti-homomorphism from the Sn-invariant subalgebra of the semigroupalgebra of into the group algebra of G 1 S_n. The colored descent algebras ofMantaci and Reutenauer are obtained as homomorphic images when G is abelian.
机译:存在一个基于有序集分区的编织排列的半个面组的众所周知的组合模型。我们对该模型进行泛化以获得与对称群5的花环乘积G?5和任意群G关联的半群FnG。Bidigare和Brown的技术适用于从半群代数的Sn不变子代数构造反同态性G 1 S_n的群代数。当G为阿贝尔式时,曼塔奇(Mantaci)和鲁特瑙尔(Reutenauer)的彩色后代代数是同构图像。

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