@article{b56597925f1147139e1d60a746752beb,

title = "Counting Subgraphs in Degenerate Graphs",

abstract = "We consider the problem of counting the number of copies of a fixed graph H within an input graph G. This is one of the most well-studied algorithmic graph problems, with many theoretical and practical applications. We focus on solving this problem when the input G has bounded degeneracy. This is a rich family of graphs, containing all graphs without a fixed minor (e.g., planar graphs), as well as graphs generated by various random processes (e.g., preferential attachment graphs). We say that H is easy if there is a linear-time algorithm for counting the number of copies of H in an input G of bounded degeneracy. A seminal result of Chiba and Nishizeki from '85 states that every H on at most 4 vertices is easy. Bera, Pashanasangi, and Seshadhri recently extended this to all H on 5 vertices and further proved that for every there is a k-vertex H which is not easy. They left open the natural problem of characterizing all easy graphs H.Bressan has recently introduced a framework for counting subgraphs in degenerate graphs, from which one can extract a sufficient condition for a graph H to be easy. Here, we show that this sufficient condition is also necessary, thus fully answering the Bera-Pashanasangi-Seshadhri problem. We further resolve two closely related problems; namely characterizing the graphs that are easy with respect to counting induced copies, and with respect to counting homomorphisms.",

keywords = "Graph algorithms, degeneracy, linear time algorithms, subgraph counting",

author = "Bera, {Suman K.} and Lior Gishboliner and Yevgeny Levanzov and C. Seshadhri and Asaf Shapira",

note = "Publisher Copyright: {\textcopyright} 2022 Association for Computing Machinery.",

year = "2022",

month = jun,

doi = "10.1145/3520240",

language = "אנגלית",

volume = "69",

journal = "Journal of the ACM",

issn = "0004-5411",

publisher = "Association for Computing Machinery (ACM)",

number = "3",

}