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Australasian Journal of Combinatorics



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The cop throttling number of a graph, introduced in 2018 by Breen et al., optimizes the balance between the number of cops used and the number of rounds required to catch the robber in a game of Cops and Robbers. In 2019, Cox and Sanaei studied a variant of Cops and Robbers in which the robber tries to occupy (or damage) as many vertices as possible and the cop tries to minimize this damage. They investigated the minimum number of vertices damaged by the robber over all games played on a given graph G, called the damage number of G. We introduce the nat- ural parameter called the damage throttling number of a graph, denoted thd(G), which optimizes the balance between the number of cops used and the number of vertices damaged in the graph. We show that dam- age throttling and cop throttling share many properties, yet they exhibit interesting differences. We prove that thd(G) is tightly bounded above by one less than the cop throttling number. We discuss infinite families of graphs which attain equality for this bound, as well as graphs which have a greater gap between the damage throttling number and the cop throttling number. For most families of connected graphs G of order n that we consider in this paper, we prove that thd(G) = O({formula presented}). However, we also find an infinite family of connected graphs G of order n for which thd(G) = Ω(n2/3).

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National Science Foundation

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This work is licensed under a Creative Commons Attribution 4.0 License.


Mathematics and Statistics