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arXiv · 2606.19796

Injectivity of symmetric polynomial maps on partitions

Rohith Thomas·Katherine Tung
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Abstract

Introduced by Ballantine, Beck, and Merca, the elementary symmetric partition function $\mathrm{pre}_k$, defined on the set of partitions with at least $k$ parts, has been a topic of recent interest. We prove that $\mathrm{pre}_k$ is injective on the set of $m$-ary partitions for positive integers $m \ge k$, generalizing the binary $k = 2$ result of Ballantine, Beck, and Merca, and complementing a result of Hadelyn, Niergarth, Li and Li showing that, for each $k \ge 3$, $\mathrm{pre}_k$ is not injective on partitions of $n$ with length $2k$ for infinitely many $n$. We introduce the skew Schur partition function $\mathrm{prs}_{\lambda'/\mu'}$, prove injectivity results for particular choices of $\lambda',\mu'$, and describe an application to representation theory.

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Rohith Thomas, Katherine Tung. 2026-06-18. Injectivity of symmetric polynomial maps on partitions. https://arxiv.org/abs/2606.19796

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