“Each chapter closes with interesting historical remarks and further bibliographical hints, followed by a collection of problems and exercises, ranging from the completely obvious to the really challenging. This makes the book a valuable source for postdoctoral students, reseachers, and anybody else who wants to get an impression of classical fields of higher analysis, with particular emphasis on nonlinear problems. The book is well written, and it contains a wealth of material.” (Jürgen Appell, zbMATH 1514.46001, 2023)“I recommend this text as a standalone text for any student who is trying to learn this material for the first time. … I conjecture that, once paired, the two-volume set will make an excellent tool for researchers looking to quickly gain insight into the tools used in modern analytical research.” (John Ross, MAA Reviews, June 17, 2023)