Degree Theory for Discontinuous Operators

Rubén Figueroa (Salvaterra de Miño, Galicia, 1984) obtained his Ph.D. degree at University of Santiago de Compostela in 2011, with a dissertation about discontinuous differential equations with deviated arguments. In the following years, he focused his research on the study of topological methods for discontinuous operators and its applications to Ordinary Differential Equations. This research gave rise to a score of scientific publications in different journals. At present, he combines his research with teaching at a secondary school.Rodrigo López Pouso (Ferrol, Galicia, 1973) obtained his Ph.D. degree in 1999 with a thesis on discontinuous differential equations. He currently works as a professor at the University of Santiago de Compostela. His research interests range from discontinuous ordinary differential equations to classical real analysis and he is the author or co-author of more than 60 papers published in high impact mathematical journals.Jorge Rodríguez-López (A Pontenova, Galicia, 1993) obtained a Ph.D. Degree in Mathematical Analysis at University of Santiago de Compostela in 2020. His line of research focuses on nonlinear analysis, with emphasis in discontinuous differential equations, topological methods and fixed point theory. His results on existence, uniqueness and multiplicity of solutions for ordinary differential equations have been published in several research papers included in the Citation Index Report. Currently, he is Assistant Professor at the University of Santiago de Compostela.

“The book leaves an overall pleasant impression. The contents are very well organized and well written. It is a valuable contribution to the literature on a class of methods of nonlinear analysis, providing an overview of classical techniques while introducing significant new ones.” (Luis Fernando Sanchez Rodrigues, Mathematical Reviews, April, 2024)“The monograph is perfectly organized and very well written. It provides a detailed presentation and insight on this new extension of the degree theory and illustrates the applicability of this tool in several problems. For these reasons, this book is suitable for researchers willing to learn more on this interesting topic.” (Guglielmo Feltrin, zbMATH 1505.47003, 2023)

• - 1. Introduction. - 2. Degree Theory for a Class of Discontinuous Operators. - 3. Fixed Point Theorems for Some Discontinuous Operators. - 4. First Order Problems. - 5. Second Order Problems and Lower and Upper Solutions. - 6. Positive Solutions for Second and Higher Order Problems.