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arXiv · 2605.18274

Max-tree for d-permutations and pattern avoidance

Thomas Muller
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Abstract

Higher dimensional permutations are tuples of d-1 permutations that can be identified with a point set in a d-dimensional grid. In N. Bonichon and P.-J. Morel, {\it J. Integer Sequences} 25 (2022), several conjectures regarding the enumeration of pattern avoiding d-permutations were stated. In this paper, we consider a mapping from d-permutations to $2^{d-1}-$ary trees that naturally generalizes the classical max-tree construction for permutations. We then show that, when restricted to d-permutations avoiding (21,12) and 231, this mapping yields a bijection with d-ary trees. This result resolves one of the conjectures of Bonichon and Morel.

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Thomas Muller. 2026-08-27. Max-tree for d-permutations and pattern avoidance. https://arxiv.org/abs/2605.18274

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