Results 51 to 60 of about 104 (103)

Total-Chromatic Number and Chromatic Index of Dually Chordal Graphs

open access: yes, 2007
A graph is dually chordal if it is the clique graph of a chordal graph. Alternatively, a graph is dually chordal if it admits a maximum neighbourhood order. This class generalizes known subclasses of chordal graphs such as doubly chordal graphs, strongly
Celina M. H. De Figueiredo   +3 more
core  

Highly parallel sparse matrix-matrix multiplication

open access: yes, 2010
. Generalized sparse matrix-matrix multiplication (or SpGEMM) is a key primitive for many high performance graph algorithms as well as for some linear solvers, such as algebraic multi-grid.
R. Gilbert, Aydin Buluc, John
core  

Subexponential-Time Algorithms for Finding Large Induced Sparse Subgraphs. [PDF]

open access: yesAlgorithmica, 2021
Novotná J   +5 more
europepmc   +1 more source

Constructing Worst Case Instances for Semidefinite Programming Based Approximation Algorithms

open access: yes, 2001
SL,BAEb#[1 programming based approximation algorithms, such as the Goemans and Williamson approximation algorithm for the MAX CUT problem, are usually shown to have certain performance guarantees using local ratio techniques.
Benny Sudakov, Uri Zwick, Noga Alon
core  

Discrete coalescent trees. [PDF]

open access: yesJ Math Biol, 2021
Collienne L   +5 more
europepmc   +1 more source

Recognizing Circulant Graphs of Prime Order in Polynomial Time

open access: yes, 1998
A circulant graph G of order n is a Cayley graph over the cyclic group Z n : Equivalently, G is circulant iff its vertices can be ordered such that the corresponding adjacency matrix becomes a circulant matrix. To each circulant graph we may associate a
Mikhail E. Muzychuk, Gottfried Tinhofer
core  

The hybrid number of a ploidy profile. [PDF]

open access: yesJ Math Biol, 2022
Huber KT, Maher LJ.
europepmc   +1 more source

Robust Matchings, Maximum Clustering, and Maximum Capacitated Medians

open access: yes, 1999
We consider complete graphs with nonnegative edge weights. A p-matching is a set of p disjoint edges. We prove the existence of a maximal (with respect to inclusion) matching M that contains for any p jM j p edges whose total weight is at least 1 p 2
Refael Hassin, Shlomi Rubinstein
core  

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