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arXiv 1105.4306math.CO
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摆边钩表和彩色匹配

Oscillating Rim Hook Tableaux and Colored Matchings

William Y. C. Chen, Peter L. Guo

摘要:

出于问题的B型模拟的双射之间的振荡tableaux和匹配,我们发现振荡m-边缘钩tableaux和m-着色匹配,其中m是一个正整数之间的对应关系。振荡m-rim钩表被定义为从空形状开始并以空形状结束的杨氏图的序列$(λ^0,λ^1,...,λ^{2n})$,使得通过添加m-rim钩或通过删除m-rim钩从$λ^{i-1}$获得$λ^{i}$。我们的双射依赖于White提出的广义Schensted算法。一个摆动的2-rim hook画面也被称为摆动的多米诺骨牌画面。当我们把注意力限制在长度为2n的两列振荡多米诺骨牌表时,我们会得到这样的表和$\{1, 2,..., 2n\}$上的非交叉2-色匹配之间的双射,它们由两个连续Catalan数的乘积$C_nC_{n+1}$计数。如果没有两个相同颜色的弧相交,则双色匹配是非相交的。我们发现,振荡多米诺骨牌tableaux最多有两列是在一对一的对应与戴克路径包装。长度为2n的Dyck路径包装是一个对(D,E),其中D是长度为2n的Dyck路径,E是被D弱覆盖的长度为2n的分散Dyck路径。因此我们推出了长度为2n的Dyck路填充可以用$C_nC_{n+1}$来计数.

英文摘要:

Motivated by the question of finding a type B analogue of the bijection between oscillating tableaux and matchings, we find a correspondence between oscillating m-rim hook tableaux and m-colored matchings, where m is a positive integer. An oscillating m-rim hook tableau is defined as a sequence $(λ^0,λ^1,...,λ^{2n})$ of Young diagrams starting with the empty shape and ending with the empty shape such that $λ^{i}$ is obtained from $λ^{i-1}$ by adding an m-rim hook or by deleting an m-rim hook. Our bijection relies on the generalized Schensted algorithm due to White. An oscillating 2-rim hook tableau is also called an oscillating domino tableau. When we restrict our attention to two column oscillating domino tableaux of length 2n, we are led to a bijection between such tableaux and noncrossing 2-colored matchings on $\{1, 2,..., 2n\}$, which are counted by the product $C_nC_{n+1}$ of two consecutive Catalan numbers. A 2-colored matching is noncrossing if there are no two arcs of the same color that are intersecting. We show that oscillating domino tableaux with at most two columns are in one-to-one correspondence with Dyck path packings. A Dyck path packing of length 2n is a pair (D, E), where D is a Dyck path of length 2n, and E is a dispersed Dyck path of length 2n that is weakly covered by D. So we deduce that Dyck path packings of length 2n are counted by $C_nC_{n+1}$.

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