Buscar
Mostrando ítems 31-40 de 44
Artículo
On the Ramsey numbers for stars versus complete graphs
(Elsevier, 2010)
For graphs G1, . . . , Gs, the multicolor Ramsey number R(G1, . . . , Gs) is the smallest integer r such that if we give any edge col-oring of the complete graph on r vertices with s colors then there exists a monochromatic copy ...
Artículo
Planning Rapid Transit Networks
(Elsevier, 2011)
Rapid transit construction projects are major endeavours that require long-term planning by several players, including politicians, urban planners, engineers, management consultants, and citizen groups. Traditionally, ...
Artículo
On Skew E–W Matrices
(Wiley, 2016)
An E–W matrix M is a ( − 1, 1)-matrix of order urn:x-wiley:10638539:media:jcd21519:jcd21519-math-0001, where t is a positive integer, satisfying that the absolute value of its determinant attains Ehlich–Wojtas' bound. M ...
Artículo
On permanents of Sylvester Hadamard matrices
(Cornell University, 2013)
It is well-known that the evaluation of the permanent of an arbitrary (−1, 1)- matrix is a formidable problem. Ryser’s formula is one of the fastest known general algorithms for computing permanents. In this paper, Ryser’s ...
Artículo
Shortcut sets for plane Euclidean networks (Extended abstract)
(Elsevier, 2016)
We study the problem of augmenting the locus N of a plane Euclidean network N by inserting iteratively a finite set of segments, called shortcut set, while reducing the diameter of the locus of the resulting network. ...
Artículo
On the number of B-flows of a graph
(Elsevier, 2014)
We exhibit explicit constructions of contractors for the graph parameter counting the number of B-flows of a graph, where B is a subset of a finite Abelian group closed under inverses. These constructions are of great ...
Artículo
Generating families of surface triangulations. The case of punctured surfaces with inner degree at least 4
(2015)
We present two versions of a method for generating all triangulations of any punctured surface in each of these two families: (1) triangulations with inner vertices of degree ≥ 4 and boundary vertices of degree ≥ 3 and (2) ...
Artículo
The maximal determinant of cocyclic (−1, 1)-matrices over D2t
(Elsevier, 2012)
Cocyclic construction has been successfully used for Hadamard matrices of order n. These -matrices satisfy that and give the solution to the maximal determinant problem when or a multiple of 4. In this paper, we approach ...
Artículo
Sex Differences in the Gut Microbiota as Potential Determinants of Gender Predisposition to Disease
(Wiley, 2019)
Scope: Dysbiosis of gut microbiota is involved in metabolic syndrome (MetS) development, which has a different incidence between men (M) and women (W). The differences in gut microbiota in MetS patients are explored ...
Artículo
Circulating miRNAs as predictive biomarkers of type 2 diabetes mellitus development in coronary heart disease patients fromt he CORDIOPREV study
(American Society of Gene and Cell Therapy, 2018-09)
Circulating microRNAs (miRNAs) have been proposed as type 2 diabetes biomarkers, and they may be a more sensitive way to predict development of the disease than the currently used tools. Our aim was to identify whether ...