Titlebook: Combinatorial Optimization and Applications; 12th International C Donghyun Kim,R. N. Uma,Alexander Zelikovsky Conference proceedings 2018 S

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https://doi.org/10.1007/978-3-030-12804-3ich . has a tree .-spanner is the tree stretch index. The problem of determining the tree stretch index has been studied by: establishing lower and upper bounds, based, for instance, on the girth value and on the minimum diameter spanning tree problem, respectively; and presenting some classes for w

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Sergio Nesmachnow,Luis Hernández Callejod . pairs of vertices that each represent a . from a source to a destination. The goal is to find a path and delay for each demand so that no two trips occupy the same vertex ., and so that the sum of trip times is minimized. We show that even for DAGs with max degree ., Time Disjoint Walks is APX-h

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Silvina Hipogrosso,Sergio Nesmachnowses called sequence digraphs, such that for each of these classes the directed path-width can be computed in polynomial time. For this purpose we define the graph classes . as the set of all digraphs . which can be defined by . sequences with at most . entries from ., such that . if and only if in o

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https://doi.org/10.1007/978-3-030-69136-3lution graphs may contain branchings and, thus, they may not be uniquely convertible into sequences. Having introduced various ways of extracting the unique parts of such solutions, we extend previously known NP-hardness results to the case that the solution graph is planar, bipartite, and subcubic,

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