Sortable elements and Cambrian lattices

Sortable elements and Cambrian lattices
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可排序元素和寒武纪晶格

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发表时间:
2005
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通讯作者:
Nathan Reading
Nathan Reading
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作者:
Nathan Reading

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摘要:我们证明了有限Coxeter群W中的Coxeter可排序元是W上弱序格同余的最小同余类代表。我们把这个同余看成是W上的寒武纪同余,使得寒武纪格是Coxeter可排序元上的弱序。这些结果展示了在W上弱序格理论背景下产生的W-加泰罗尼亚组合学。
Abstract.We show that the Coxeter-sortable elements in a finite Coxeter group W are the minimal congruence-class representatives of a lattice congruence of the weak order on W. We identify this congruence as the Cambrian congruence on W, so that the Cambrian lattice is the weak order on Coxeter-sortable elements. These results exhibit W-Catalan combinatorics arising in the context of the lattice theory of the weak order on W.