40 research outputs found
UMA APLICAÇÃO DA TEORIA DOS CONJUNTOS FUZZY NA ANÁLISE DA POBREZA: O CASO DAS REGIÕES METROPOLITANAS DO SUDESTE BRASILEIRO – 2000
Split Nonthreshold Laplacian Integral Graphs
The aim of this article is to answer a question posed by Merris in
European Journal of Combinatorics, 24(2003)413¡430, about the pos
sibility of finding split nonthreshold graphs that are Laplacian integral,
i.e., graphs for which the eigenvalues of the corresponding Laplacian
matrix are integers. Using Kronecker products, balanced incomplete
block designs, and solutions to certain Diophantine equations, we show
how to build infinite families of these graphs
Computing the Determinant of the Distance Matrix of a Bicyclic Graph
Let G be a connected graph with vertex set V = {v1, ..., vn}. The distance d(vi, vj) between two vertices vi and vj is the number of edges of a shortest path linking them. The distance matrix of G is the n × n matrix such that its (i, j)-entry is equal to d(vi, vj). A formula to compute the determinant of this matrix in terms of the number of vertices was found when the graph either is a tree or is a unicyclic graph. For a byciclic graph, the determinant is known in the case where the cycles have no common edges. In this paper, we present some advances for the remaining cases; i.e., when the cycles share at least one edge. We also present a conjecture for the unsolved cases.Fil: Dratman, Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de General Sarmiento. Instituto de Ciencias; ArgentinaFil: Grippo, Luciano Norberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de General Sarmiento. Instituto de Ciencias; ArgentinaFil: Safe, Martin Dario. Universidad Nacional del Sur. Departamento de Matemática; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: da Silva Jr., Celso M. Centro Federal de Educação Tecnológica; BrasilFil: Del Vecchio, Renata R.. Universidade Federal Fluminense; BrasilLAGOS 2019: X Latin and American Algorithms, Graphs and Optimization SymposiumBelo HorizonteBrasilUniversidad Federal de Minas Gerai
Qualitative analysis of the viability of autogenous fat grafts grafted in different environments of interstitial pressure. Preliminary results and description of a new experimental model in mini-pigs
The MAORY first-light adaptive optics module for E-ELT
The MAORY adaptive optics module is part of the first light instrumentation suite for the E-ELT. The MAORY project phase B is going to start soon. This paper contains a system-level overview of the current instrument design
MAORY: adaptive optics module for the E-ELT
MAORY is one of the four instruments for the E-ELT approved for construction. It is an adaptive optics module offering two compensation modes: multi-conjugate and single-conjugate adaptive optics. The project has recently entered its phase B. A system-level overview of the current status of the project is given in this paper