Shouchuan Hu is a Distinguished Professor at Missouri State University, USA. He holds a PhD in Mathematics from the University of Texas at Arlington. Dr. Hu is Director of the AIMS – American Institute of Mathematical Sciences and Editor-in-Chief of the “Discrete and Continuous Dynamical Systems” journal.  He co-authored, along with Dr. Papageorgiou, the two-volume set "Handbook of Multivalued Analysis" (1997), published by Springer.Nikolaos S. Papageorgiou is a Professor at the National Technical University of Athens, Greece. He holds a PhD in Applied Mathematics (1983) from Harvard University, USA, and degrees in Mathematics and Electrical Engineering, both from Massachusetts Institute of Technology – MIT. Dr. Papageorgiou has co-authored over a dozen books, including “Exercises in Analysis” (2016) and “Nonlinear Analysis - Theory and Methods” (2019), both published by Springer.

• Degree Theory.- Fixed Point Theory.- Critical Point Theory.- Spectra of Differential Operators.- Elliptic Boundary Value Problems.- Evolution Equations.- Calculus of Variations.- Mathematical Economics and Game Theory.- References.- Index.

“Every chapter comes with a remarks section detailing the origin of the results presented in the main body of the text. … this volume along with its predecessor covers a lot of ground in abstract analysis and will be a useful resource for many readers.” (Dirk Werner, zbMATH 1558.46002, 2025)