Exploració per autor "Garriga Valle, Ernest"
Ara es mostren els items 26-31 de 31
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Some families of orthogonal polynomials of a discrete variable and their applications to graphs and codes
Fiol Mora, Miquel Àngel; Garriga Valle, Ernest; Fàbrega Canudas, José; Cámara Vallejo, Marc (2000-08)
Article
Accés obertWe present some related families of orthogonal polynomials of a discrete variable and survey some of their applications in the study of (distance-regular) graphs and (completely regular) codes. One of the main peculiarities ... -
The alternating and adjacency polynomials, and their relation with the spectra and diameters of graphs
Fiol Mora, Miquel Àngel; Garriga Valle, Ernest (Elsevier Science Publishers B. V., 1998-10)
Article
Accés obertLet Γ be a graph on n vertices, adjacency matrix A, and distinct eigenvalues λ > λ_1 > λ_2 > · · · > λ_d. For every k = 0,1, . . . ,d −1, the k-alternating polynomial P_k is defined to be the polynomial of degree k and norm | -
The geometry of t-cliques in k-walk-regular graphs
Dalfó Simó, Cristina; Fiol Mora, Miquel Àngel; Garriga Valle, Ernest (2008-09)
Article
Accés obertA graph is walk-regular if the number of cycles of length $\ell$ rooted at a given vertex is a constant through all the vertices. For a walk-regular graph $G$ with $d+1$ different eigenvalues and spectrally maximum ... -
The geometry of t-spreads in k-walk-regular graphs
Dalfó Simó, Cristina; Fiol Mora, Miquel Àngel; Garriga Valle, Ernest (Wiley InterScience, 2010-08)
Article
Accés obertA graph is walk-regular if the number of closed walks of length rooted at a given vertex is a constant through all the vertices for all . For a walk-regular graph G with d+1 different eigenvalues and spectrally maximum ... -
When almost distance regularity attains distance regularity
Dalfó Simó, Cristina; Van Dam, Edwin; Fiol Mora, Miquel Àngel; Garriga Valle, Ernest (2010)
Text en actes de congrés
Accés restringit per política de l'editorial -
When almost distance-regularity attains distance-regularity
Dalfó Simó, Cristina; Van Dam, Edwin; Fiol Mora, Miquel Àngel; Garriga Valle, Ernest (2010)
Text en actes de congrés
Accés obertGenerally speaking, `almost distance-regular graphs' are graphs which share some, but not necessarily all, regularity properties that characterize distance-regular graphs. In this paper we rst propose four basic di erent ...