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Oriented star packings

Authors: R. C. Brewster; P. Hell; RIZZI, ROMEO;
Abstract

Given a family \(S\) of oriented stars, an \(S\)-packing in a digraph \(D\) is a collection of vertex disjoint subgraphs of \(D\), each of which is isomorphic to a member of \(S\). The \(S\)-packing problem is to ascertain the maximum number of vertices of a host \(D\) that can be covered by an \(S\)-packing of \(D\). The paper shows a dichotomy for the decision version of the \(S\)-packing problem, giving an exact classification of which problems are polynomial time solvable and which are NP-complete. For the polynomial problem, it provides Hall type min-max theorems, including versions for locally degree-constrained variants of the problems. It also shows that the \(S\)-packing problem is polynomial for some \(S\) and NP-complete otherwise.

Country
Italy
Keywords

packing problem, Good characterization, Directed graphs (digraphs), tournaments, min-max theorem, Packing problems, good characterization, Theoretical Computer Science, Oriented stars; Packing problems; Min-max theorems; Good characterization, Computational Theory and Mathematics, Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.), oriented star, Discrete Mathematics and Combinatorics, Min-max theorems, Oriented stars

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
6
Average
Average
Average
hybrid