Helena Gomes

collaborators

2 papers

math.CO2025

Lexicographic products and lexicographic powers of graphs -- a walk matrix approach

Domingos M. Cardoso, Paula Carvalho, Helena Gomes +2

The characteristic polynomial and the spectrum of the lexicographic product of graphs $H [G]$ , a specific instance of the generalized composition (also called $H$ -join), are explici…

math.CO2021

The H-join of arbitrary families of graphs

Domingos M. Cardoso, Helena Gomes, Sofia J. Pinheiro

The $H$ -join of a family of graphs $G = {G_{1}, \dots, G_{p}}$ , also called the generalized composition, $H [G_{1}, \dots, G_{p}]$ , where all graphs are undirected, simple and fin…