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arXiv 1107.3472math.CO
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Tamari格中平衡二叉树的区间

Intervals of balanced binary trees in the Tamari lattice

Samuele Giraudo

摘要:

我们证明了在Tamari格中平衡二叉树的集合是由区间封闭的。本文证明了区间[T,T '](其中T和T'是平衡二叉树)同构于超立方体的偏序集.我们引入同步语法,允许生成树状结构,并获得定点函数方程枚举这些。我们还介绍了不平衡树模式,并表明它们可以用来描述一些集的平衡二叉树,发挥了特殊的作用,在Tamari格。最后,我们调查其他家庭的二叉树,也关闭的间隔塔马利格。

英文摘要:

We show that the set of balanced binary trees is closed by interval in the Tamari lattice. We establish that the intervals [T, T'] where T and T' are balanced binary trees are isomorphic as posets to a hypercube. We introduce synchronous grammars that allow to generate tree-like structures and obtain fixed-point functional equations to enumerate these. We also introduce imbalance tree patterns and show that they can be used to describe some sets of balanced binary trees that play a particular role in the Tamari lattice. Finally, we investigate other families of binary trees that are also closed by interval in the Tamari lattice.

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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