Qual. Theory Dyn. Syst. (2010) 9:5–8 DOI 10.1007/s12346-010-0027-4 Qualitative Theory of Dynamical Systems To the Memory of Javier Chavarriga Isaac A. García · Jaume Giné · Maite Grau · Josep Mallol · Susanna Maza · Jordi Sorolla Received: 11 December 2008 / Accepted: 11 December 2008 / Published online: 23 June 2010 © Springer Basel AG 2010 Let the following text give testimony of a life dedicated to mathematics. Javier Chavarriga coursed his degree in Mathematical Sciences in the Faculty of Mathematics of the Central University in Barcelona during the period 1974–79, with a specialization in Mathematical Analysis, and he obtained his degree in June of 1979. He obtained the Ph.D. in Mathematical Sciences in the same faculty in November of 1985, with the qualification “Apto CUM LAUDE” under the supervision of Dr. Carlos Simó Torres. During the academic years 1979–83 he practised as an assistant professor in the Department of Functional Equations at the University of Barcelona. Many students, today professors, remember that brilliant graduate who gave lessons on ordinary differential equations and who transmitted his energy and enthusiasm towards mathematics, feelings that always characterized him. He started the academic year 1983–1984 as a professor “Collaborator Teaching and Research Professor” in the Faculty of Computer Science in the Polytechnic University of Catalonia. In November of 1984 he obtains a position as assistant professor in Gen- eral Mathematics in the Faculty of Pharmacy of the University of Barcelona, where he continues his teaching duties between November of 1984 and June of 1992. In January of 1985 he is designated “Profesor Titular de Universidad interino” of Applied Math- ematics. In May of 1987 he obtains by examination a position of “Profesor Titular de Universidad” of Applied Mathematics in the Department of Applied Mathematics and Analysis of the University of Barcelona. During the 90’s, the Catalan university system suffers a re-structuration. In that moment, there were only three universities in Catalonia with several delegations in the different Catalan regions. With the new system, new universities are created or I. A. García · J. Giné (B ) · M. Grau · J. Mallol · S. Maza · J. Sorolla Departament de Matemàtica, Universitat de Lleida, Escola Politècnica Superior, Avda. Jaume II, 69, 25001 Lleida, Spain e-mail: gine@matematica.udl.cat