John Forbes Nash, Jr. was Senior Research Mathematician at Princeton University. Professor Nash was the recipient of the Nobel Prize in Economics in 1994 and the Abel Prize in Mathematics in 2015 and is most widely known for the Nash equilibrium in game theory and the Nash embedding theorem in geometry and analysis. He was also the recipient of the John von Neumann Theory prize in 1978. Nash's groundbreaking works in game theory, algebraic & differential geometry, non-linear analysis and partial differential equations have provided insight into the factors that govern chance and events inside complex systems in daily life. Moreover, Nash's theories are widely used in economics, computing, evolutionary biology, artificial intelligence, accounting, politics and other disciplines.   Michael Th. Rassias during his collaboration in 2014-2015 with John Forbes Nash, Jr. for the preparation of this book was a postdoctoral researcher at the Departments of Mathematics of Princeton University and ETH-Zurich, working at Princeton. He is currently a postdoctoral researcher at the Institute of Mathematics of the University of Zurich and a visiting researcher at the Program in Interdisciplinary Studies of the Institute for Advanced Study, Princeton. His research interests lie in mathematical analysis and analytic number theory. Rassias has received several awards in national and international mathematical Olympiads. He was also awarded the 2014 Notara Prize in Mathematics from the Academy of Athens. He has also authored, co-authored and co-edited five other books with Springer.