Author

Rui-Yi Yang

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Preprint Sep 2026

The exponent of harmonic LCM avoidance

Fix $k\ge 3$, and let $f_k(N)$ be the largest harmonic sum of a subset of $[N]$ containing no $k$ distinct integers with a common pairwise least common multiple. We prove that $f_k(N)=(\log N)^{\gamma_k+o(1)}$ for a well-defined exponent $\gamma_k\in(0,1]$. Following the weighted-pressure idea of Chojecki, we give a se...

Yan-Ping Luo, Rui-Yi Yang, Ke-Heng Zhu · 0 citations

Preprint Jul 2026

Exterior power sums

We prove that for every fixed $\lambda>0$ and all sufficiently large $n$, any $z_1,\dots,z_n\in\C$ with $|z_j|\geq1$ satisfy $\max_{2\leq k\leq n+1}|\sum_j z_j^k|>e^{-\lambda n}$. Consequently, the $n$th root of the optimal maximum tends to $1$, so no constant $C>1$ in Erd\H{o}s 973 can exist. The proof combines a trun...

Yan-Ping Luo, Rui-Yi Yang, Ke-Heng Zhu · 1 citation