Avoiding patterns of length three in compositions and multiset permutations

Avoiding patterns of length three in compositions and multiset permutations
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DOI:
10.1016/j.aam.2005.06.005
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发表时间:
2006-02
期刊:
Adv. Appl. Math.
影响因子:
--
通讯作者:
Silvia Heubach;T. Mansour
Silvia Heubach;T. Mansour
中科院分区:
其他
文献类型:
--
作者:
Silvia Heubach;T. Mansour

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我们找到了避免字母表{1,2}上长度为三的单个模式或一对模式的合成数量的生成函数,并确定其中哪些在合成上是Wilf等价的。我们还得到了避免这些相同的模式,并确定这些模式的Wilf-等价排列的多集的排列数。
We find generating functions for the number of compositions avoiding a single pattern or a pair of patterns of length three on the alphabet {1,2} and determine which of them are Wilf-equivalent on compositions. We also derive the number of permutations of a multiset which avoid these same patterns and determine the Wilf-equivalence of these patterns on permutations of multisets.