Ara es mostren els items 1-20 de 22

• #### A new application of the $\otimes_h$-product to $\alpha$-labelings ﻿

(2015)
Article
Accés obert
The weak tensor product was introduced by Snevily as a way to construct new graphs that admit a-labelings from a pair of known a-graphs. In this article, we show that this product and the application to a-labelings can be ...
• #### A new labeling construction from the -product ﻿

(2017-08-01)
Article
Accés restringit per política de l'editorial
The ¿h-product that is referred in the title was introduced in 2008 as a generalization of the Kronecker product of digraphs. Many relations among labelings have been obtained since then, always using as a second factor a ...
• #### Bi-magic and other generalizations of super edge-magic labelings ﻿

(2011-06-15)
Article
Accés restringit per política de l'editorial
In this paper, we use the product ⊗h in order to study super edge-magic labelings, bi-magic labelings and optimal k-equitable labelings. We establish, with the help of the product ⊗h, new relations between super edge-magic ...
• #### Characterizing path-like trees from linear configurations ﻿

(2017)
Comunicació de congrés
Accés obert
Assume that we embed the path Pn as a subgraph of a 2-dimensional grid, namely, Pk¿Pl. Given such an embedding, we consider the ordered set of subpaths L1, L2,...,Lm which are maximal straight segments in the embedding, ...
• #### Connectivity and other invariants of generalized products of graphs ﻿

(2015-02-24)
Article
Accés obert
Figueroa-Centeno et al. [4] introduced the following product of digraphs let D be a digraph and let G be a family of digraphs such that V (F) = V for every F¿G. Consider any function h:E(D)¿G. Then the product D¿hG is the ...
• #### Descomposicions de grafs en arbres. ﻿

(Universitat Politècnica de Catalunya, 2003-02-20)
Tesi
Accés obert
• #### (Di)graph products, labelings and related results ﻿

(2017-07)
Article
Accés obert
Gallian's survey shows that there is a big variety of labelings of graphs. By means of (di)graphs products we can establish strong relations among some of them. Moreover, due to the freedom of one of the factors, we can ...
• #### Distance labelings: a generalization of Langford sequences ﻿

(2016-01-05)
Article
Accés obert
A Langford sequence of order m and defect d can be identified with a labeling of the vertices of a path of order 2m in which each labeled from d up to d + m - 1 appears twice and in which the vertices that have been label ...
• #### Enumerating super edge-magic labelings for some types of path-like trees ﻿

(2010-06-02)
Article
Accés obert
The main goal of this paper is to use a variation of the Kronecker product of matrices in order to obtain lower bounds for the number of non isomorphic super edge-magic labelings of some types of path-like trees. As a ...
• #### Enumerating super edge-magic labelings for the union of non-isomorphic graphs ﻿

(2011-06-15)
Article
Accés obert
A super edge-magic labeling of a graph G=(V,E) of order p and size q is a bijection f:V ∪E→{i}p+qi=1 such that: (1) f(u)+f(uv)+f(v)=k for all uv∈E; and (2) f(V )={i}pi=1. Furthermore, when G is a linear forest, the super ...
• #### Every tree is a large subtree of a tree that decomposes Kn or Kn,n ﻿

(2010-02-28)
Article
Accés restringit per política de l'editorial
Let T be a tree with m edges. A well-known conjecture of Ringel states that T decomposes the complete graph $K_{2m+1}$. Graham and Häggkvist conjectured that T also decomposes the complete bipartite graph $K_{m,m}$. In ...
• #### Langford sequences and a product of digraphs ﻿

(2015-12-07)
Article
Accés obert
Skolem and Langford sequences and their many generalizations have applications in numerous areas. The ¿h-product is a generalization of the direct product of digraphs. In this paper we use the ¿h-product and super edge-magic ...
• #### Magic coverings and the Kronecker product ﻿

(2009-12-11)
Article
Accés obert
In this paper we study a relationship existing among (super) magic coverings and the well known Kronecker product of matrices. We also introduce the concept of Zn–property for digraphs in order to study this relation ...
• #### Magic coverings and the Kronecker product ﻿

(2014-11-01)
Article
Accés restringit per política de l'editorial
In this paper we study a relationship existing among (super) magic coverings and the well known Kronecker product of matrices. We also introduce the concept of Z(n)-property for digraphs in order to study this relation ...
• #### On the beta-number of forests with isomorphic components ﻿

(2018)
Article
Accés obert
The beta-number, ß (G), of a graph G is defined to be either the smallest positive integer n for which there exists an injective function f : V (G) ¿ {0, 1, . . . , n} such that each uv ¿ E (G) is labeled |f (u) - f (v)| ...
• #### Perfect edge-magic graphs ﻿

(2014-01-01)
Article
Accés restringit per política de l'editorial
The study of the possible valences for edge-magic labelings of graphs has motivated us to introduce the concept of perfect edge-magic graphs. Intuitively speaking, an edge-magic graph is perfect edge-magic if all possible ...
• #### Perfect (super) Edge-Magic Crowns ﻿

(2017-01-06)
Article
Accés obert
A graph G is called edge-magic if there is a bijective function f from the set of vertices and edges to the set {1,2,…,|V(G)|+|E(G)|} such that the sum f(x)+f(xy)+f(y) for any xy in E(G) is constant. Such a function is ...
• #### Problemas abiertos sobre etiquetamientos super edge-magic y temas relacionados ﻿

(2010)
Text en actes de congrés
Accés obert
El tema de los etiquetamientos de grafos ha experimentado un fuerte impulso en los últimos 40 años, muestra de ello son los dos libros dedicados en exclusiva a ellos, un completísimo artículo ”survey” y más de 1000 ...
• #### Rainbow eulerian multidigraphs and the product of cycles ﻿

(2016-01-01)
Article
Accés obert
An arc colored eulerian multidigraph with l colors is rainbow eulerian if there is an eulerian circuit in which a sequence of l colors repeats. The digraph product that refers the title was introduced by Figueroa-Centeno ...
• #### Super edge-magic models ﻿

(2011-04-20)
Article
Accés obert
In this paper, we generalize the concept of super edge-magic graph by introducing the new concept of super edge-magic models.