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A Short Proof of Zhang's Conjecture on Stack-Sortable Permutations

Maximus Lu

Source record

Source: arXiv

Published: Oct 23, 2026

arXiv: 2610.32824

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Source abstract

We give a short proof of Zhang's conjecture that the number of stack-sortable permutations of length n+1n + 1 which end in their smallest element is equal to the nn-th Motzkin number.

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