Sorting and preimages of pattern classes

Sorting and preimages of pattern classes
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模式类的排序和原像

DOI:
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发表时间:
2012
期刊:
arXiv.org
影响因子:
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通讯作者:
Henning Úlfarsson
Henning Úlfarsson
中科院分区:
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文献类型:
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作者:
Anders Claesson;Henning Úlfarsson

文献摘要

被引文献

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我们引入一种算法来确定排序操作(例如堆栈排序或冒泡排序)何时输出给定模式。该算法提供了对 West-2-stack-sortable 排列描述的新证明,即在模式方面两次通过堆栈时完全排序的排列。我们还解决了描述 West-3-stack-sortable 排列的长期存在的问题。这需要一种新型的广义排列模式,我们称之为装饰模式。
We introduce an algorithm to determine when a sorting operation, such as stack-sort or bubble-sort, outputs a given pattern. The algorithm provides a new proof of the description of West-2-stack-sortable permutations, that is permutations that are completely sorted when passed twice through a stack, in terms of patterns. We also solve the long-standing problem of describing West-3-stack-sortable permutations. This requires a new type of generalized permutation pattern we call a decorated pattern.