This is the fourth edition of the joint Workshop Chileno-Paulista em/en Grafos. The event gathers researchers mainly from Chile and São Paulo that have been working in Combinatorics and Graph Theory.

Our main objective is to study graphs from a theoretical point of view, thus contributing to a better understanding of the laws that govern the behavior of these structures.

This workshop is the result of the joint research project "Extremal and Structural Problems in Graph Theory", from the Brazilian funding agency FAPESP (The São Paulo Research Foundation) and the Chilean funding agency ANID (Agencia Nacional de Investigación y Desarrollo, successor of CONICYT).

In this edition, we will have participants from IRIF (Institut de Recherche en Informatique Fondamentale), LSE (London School of Economics), TUB (TU Berlin), UB (Universitat de Barcelona) UCHILE (Universidad de Chile), UDEC (Universidad de Concepción), UFABC (Universidade Federal do ABC), USP (Universidade de São Paulo), and UVAL (Universidad de Valparaíso).