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arXiv 1202.2483math.CO
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满填充回路的交错路与反转数

Alternating paths of fully packed loops and inversion number

Stephen Ng

摘要:

我们考虑一个固定的大小为n的完全填充循环上的交替路径集。这个集合与大小为n的完全填充循环的集合是双射的。此外,对于一个特殊的选择完全包装的循环,我们证明了一组交替的路径嵌套密切循环,我们称之为戴克岛。Dyck岛可以构造为一个联盟的晶格Dyck路径,我们使用这种结构,给出一个简单的图形公式计算的反转数的交替符号矩阵。

英文摘要:

We consider the set of alternating paths on a fixed fully packed loop of size n. This set is in bijection with the set of fully packed loops of size n. Furthermore, for a special choice of fully packed loop, we demonstrate that the set of alternating paths are nested osculating loops, which we call Dyck islands. Dyck islands can be constructed as a union of lattice Dyck paths, and we use this structure to give a simple graphical formula for the calculation of the inversion number of an alternating sign matrix.

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