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广义超立方体上的懒惰警察与强盗变体问题的改进界

Improved bounds for the lazy cops and robbers on generalized hypercubes

Anand Babu, Ashwin Jacob, Karunakaran Murali Krishnan, Reshma Roy, Sreekala S

arXiv 2609.00720首次发表:更新:

发表机构

National Institute of Technology Calicut(卡利卡特国家技术学院)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

本文研究广义超立方体上速度为d的懒惰警察与强盗变体问题,推导了该问题中最少警察数的渐近上界,且当d=1时改进了现有上界。

AI 中文摘要

在速度为d的懒惰警察与强盗变体问题中,警察和强盗交替行动:警察回合中,所有警察要么保持静止,要么一名警察移动长度不超过d的路径;强盗回合中,强盗要么静止,要么移动到相邻顶点。记c_L^(d)(G)为能在有限回合内迫使警察占据强盗顶点的最少警察数,我们在顶点集为{0,1,…,m}^n的广义超立方体Q(n,m)上研究该变体。对于固定整数m≥2和d≥1,我们证明当n→∞时,c_L^(d)(Q(n,m))=O((m+1)^n / n^(d+1/2));当d=1时,我们的结果将Sim、Tan和Wong给出的普通懒惰警察数的上界改进了log n倍。

英文摘要

In Lazy Cops and Robbers, at most one cop moves on each cop turn. We study the lazy cop number of the generalized hypercube $Q(n,m)$, whose vertex set is ${\{0,1,\ldots,m\}}^n$. For each fixed integer $m\geq2$, we prove the asymptotic upper bound $$c_{\mathrm{L}}(Q(n,m))=O\!\left(\frac{{(m+1)}^n}{n^{3/2}}\right).$$ This result improves the upper bound of Sim, Tan, and Wong by a factor of $\log n$. The proof combines a moving dominating-set argument with an explicit dominating-set construction inside the support classes of each level. As a separate domination result, we show that, for fixed integers $m\geq2$ and $d\geq1$, the Hamming graph $K_m^{\square k}$ has a distance-$d$ dominating set of asymptotic size $O(m^k/k^d)$. This order is optimal up to a constant factor.

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