@Moritz Dear Moritz,
I am using your book and have some remarks on it that I hope you find useful. It appears the address you are using here is send-only.
The content of the book is good, but there are some problems with the publishing process. E.g. the first couple of pages are missing completely. The publisher keeps his coordinates secret too.
Where can I send my remarks? best wishes, -- Theo van den Heuvel
