On several extremal problems in graph theory involving gromov hyperbolicity constant

Mención Internacional en el título de doctor In this Thesis we study the extremal problems of maximazing and minimazing the hyperbolicity constant on several families of graphs. In order to properly raise our research problem, we need to introduce some important definitions and make some remarks on the graphs we study. Programa Oficial de Doctorado en Ingeniería Matemática Presidente: Elena Romera Colmenarejo.- Secretario: Ana María Portilla Ferreira.- Vocal: José María Sigarreta Almira