L. Lima

collaborators

3 papers

stat.ME2022

Heuristic Algorithm for Univariate Stratification Problem

José Brito, Gustavo Semaan, Leonardo de Lima +1

In sampling theory, stratification corresponds to a technique used in surveys, which allows segmenting a population into homogeneous subpopulations (strata) to produce statistics w…

math.CO2022

Bounding the sum of the largest signless Laplacian eigenvalues of a graph

Aida Abiad, Leonardo de Lima, Sina Kalantarzadeh +2

We show several sharp upper and lower bounds for the sum of the largest eigenvalues of the signless Laplacian matrix. These bounds improve and extend previously known bounds.

math.SP2013

Extremal graphs for the sum of the two largest signless Laplacian eigenvalues

Carla Silva Oliveira, Leonardo de Lima, Paula Rama +1

Let G be a simple graph on $n$ vertices and $e (G)$ edges. Consider $Q (G) = D + A$ as the signless Laplacian of $G$ , where $A$ is the adjacency matrix and $D$ is the diagonal matrix…