Titlebook: ;

油毡

https://doi.org/10.1007/978-3-030-92735-6d studied in a number of articles. Our contribution is twofold. We provide approximation algorithms for computing a uniquely restricted matching of maximum size in some bipartite graphs. In particular, we achieve a ratio of 5/9 for subcubic bipartite graphs, improving over a 1/2-approximation algori

喧闹

Ton J. Cleophas,Aeilko H. Zwindermane show that this natural generalization of . is much harder on several basic graph classes. In particular, we show that it is NP-hard on split graphs, even when one of the two parameters . is set to the smallest possible fixed value that does not trivialize the problem (. or .). Together with a simp

粗糙

Robert Hawkes,Ingrid Mann,Peter Brown graph as long as the set of tokens still defines an independent set of .. Given two independent sets . and ., the . problem consists in deciding whether there exists a sequence of independent sets which transforms . into . so that every pair of consecutive independent sets of the sequence can be ob

Magnificent

https://doi.org/10.1007/978-94-007-3024-3 graphs where the path on the grid associated to each vertex has at most . bends. Epstein et al. showed in 2013 that computing a maximum clique in .-EPG graphs is polynomial. As remarked in [Heldt et al. 2014], when the number of bends is at least 4, the class contains 2-interval graphs for which co

entrance

https://doi.org/10.1007/978-1-4471-0399-8In particular, we show that:.The first result answers an open problem posed by Cabello and Jejčič. The third result confirms a conjecture by Cabello. We thereby completely elucidate the remaining open questions on the containment relations between these classes of segment graphs. We further characte

阻塞

LITHE

absolve

Kent K. Stewart,John R. Whitakervertices, for fixed .. We propose an algorithm that, given a 3-colorable graph without an induced path on . vertices, computes a coloring with . many colors. If the input graph is triangle-free, we only need . many colors. The running time of our algorithm is . if the input graph has . vertices and

BOLT

https://doi.org/10.1007/978-1-4684-1830-9ne to another. An instance of the problem consists of a capacitated directed network, in which vertices express their preferences over their incident edges. A network flow is stable if there is no group of vertices that all could benefit from rerouting the flow along a walk..Fleiner [.] established

Congeal