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Wilf classification of three and four letter signed patterns

W. M. B. Dukes·T. Mansour·A. Reifegerste
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Abstract

We give some new Wilf equivalences for signed patterns which allow the complete classification of signed patterns of lengths three and four. The problem is considered for pattern avoidance by general as well as involutive signed permutations.

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W. M. B. Dukes, T. Mansour, A. Reifegerste. 2006-04-03. Wilf classification of three and four letter signed patterns. https://arxiv.org/abs/math/0604025

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