This book is a translation of the original German 1st edition  by Ottmar Ette, published by J.B. Metzler, imprint of Springer-Verlag GmbH Germany, part of Springer Nature in 2019. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). The author (with the friendly support of Patricia Gwozdz) has subsequently revised the text further in an endeavour to refine the work stylistically. weiterlesen