These notes summarize in part lectures held regularly at the University of Zurich and, in the Summer of 1974, at the Semi- nario Latinoamericano de QUimica Cuantica in Mexico. I am grateful to those who have encouraged me to publish these lec- tures or have contributed to them by their suggestions. In particular, I wish to thank Professor J. Keller of the Univer- sidad Nacional Autonoma in Mexico, Professor H. Labhart and Professor H. Fischer of the University of Zurich, as well as my former students Dr. J. Kuhn, Dr. W. Hug and Dr. R. Geiger. The aim of these notes is to provtde a summary and...
These notes summarize in part lectures held regularly at the University of Zurich and, in the Summer of 1974, at the Semi- nario Latinoamericano de QU...
