Mathematical Methods in Physics: Distributions, Hilbert Space Operators, Variational Methods, and Applications in Quantum Physics (Progress in Mathematical Physics Book 69) 2nd Edition, Kindle Edition

It is a difficult book. It is written for physicists, but it has to many mathematical details that make the book difficult to read. On the other hand there are few examples . For instance, it is said that all Hilbert spaces are isomorphic. But there are topological that are lost between then. No examples are given.