Zobrazeno 1 - 10
of 1 136
pro vyhledávání: '"A. Dalfó"'
We consider lifting eigenvalues and eigenvectors of graphs to their {\em factored lifts}, derived by means of a {\em combined voltage assignment} in a group. The latter extends the concept of (ordinary) voltage assignments known from regular covering
Externí odkaz:
http://arxiv.org/abs/2409.02463
In this paper, we first give a new result characterizing the strongly connected digraphs with a diameter equal to that of their line digraphs. Then, we introduce the concepts of the inner diameter and inner radius of a digraph and study their behavio
Externí odkaz:
http://arxiv.org/abs/2409.02125
The chordal ring (CR) graphs are a well-known family of graphs used to model some interconnection networks for computer systems in which all nodes are in a cycle. Generalizing the CR graphs, in this paper, we introduce the families of chordal multi-r
Externí odkaz:
http://arxiv.org/abs/2409.00520
Autor:
Dalfó, C., Fiol, M. A.
In this note, we give an infinite family of optimal graphs called $G^+(d,c)$. They are optimal in the sense that they have the maximum possible number of vertices for given a diameter $d$ and the so-called `outer multiset dimension' $c$. We provide t
Externí odkaz:
http://arxiv.org/abs/2409.00516
Autor:
M. Alventosa-Zaidin, L. Guix Font, M. Benitez Camps, C. Roca Saumell, G. Pera, M. Teresa Alzamora Sas, R. Forés Raurell, O. Rebagliato Nadal, A. Dalfó-Baqué, J. Brugada Terradellas
Publikováno v:
European Journal of General Practice, Vol 25, Iss 3, Pp 109-115 (2019)
Background: Right bundle branch block (RBBB) is among the most common electrocardiographic abnormalities. Objectives: To establish the prevalence and incidence of RBBB in the general population without cardiovascular events (CVE) and whether RBBB inc
Externí odkaz:
https://doaj.org/article/a80ce2b89cac4291880ccd4508232400
A bipartite graph $G=(V,E)$ with $V=V_1\cup V_2$ is biregular if all the vertices of each stable set, $V_1$ and $V_2$, have the same degree, $r$ and $s$, respectively. This paper studies difference sets derived from both Abelian and non-Abelian group
Externí odkaz:
http://arxiv.org/abs/2404.04680
This paper describes a general method for representing $k$-token graphs of Cayley graphs as lifts of voltage graphs. This allows us to construct line graphs of circulant graphs and Johnson graphs as lift graphs on cyclic groups. As an application of
Externí odkaz:
http://arxiv.org/abs/2404.02122
In this note, we introduce the concept of factored lift, associated with a combined voltage graph, as a generalization of the lift graph. We present a new method for computing the eigenvalues and eigenspaces of factored lifts.
Externí odkaz:
http://arxiv.org/abs/2404.02128
The $k$-token graph $F_k(G)$ of a graph $G$ is the graph whose vertices are the $k$-subsets of vertices from $G$, two of which being adjacent whenever their symmetric difference is a pair of adjacent vertices in $G$. In this paper, we propose a gener
Externí odkaz:
http://arxiv.org/abs/2403.20148
Mixed graphs can be seen as digraphs with arcs and edges (or digons, that is, two opposite arcs). In this paper, we consider the case where such graphs are bipartite and in which the undirected and directed degrees are one. The best graphs, in terms
Externí odkaz:
http://arxiv.org/abs/2403.18943