Abstract
A graph G is called a pairwise compatibility graph (PCG, for short) if it admits a tuple \((T,w, d_{\min },d_{\max })\) of a tree T whose leaf set is equal to the vertex set of G, a non-negative edge weight w, and two non-negative reals \(d_{\min }\le d_{\max }\) such that G has an edge between two vertices \(u,v\in V\) if and only if the distance between the two leaves u and v in the weighted tree (T, w) is in the interval \([d_{\min }, d_{\max }]\). The tree T is also called a witness tree of the PCG G. How to recognize PCGs is a wide-open problem in the literature. This paper gives a complete characterization for a graph to be a star-PCG (a PCG that admits a star as its witness tree), which provides us the first polynomial-time algorithm for recognizing star-PCGs.
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The work was supported by the National Natural Science Foundation of China, under Grants 61972070 and 61772115.
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Xiao, M., Nagamochi, H. Characterizing Star-PCGs. Algorithmica 82, 3066–3090 (2020). https://doi.org/10.1007/s00453-020-00712-8
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DOI: https://doi.org/10.1007/s00453-020-00712-8