Acknowledgements

First of all, I must thank the numerous authors who have written papers or books containing parts that I have found to be illuminating, or a good summary of a concept, and that have been in some way incorporated here; this fact may not be explicitly mentioned, but their work is always cited. A number of people have provided inspiration more directly by personal interaction; some of those are acknowledged in the text. After the files went online, the following people have sent in additions, references and/or suggestions for the website that have been incorporated into these pages: Thanks!

Mikhail Altaisky (JINR, Dubna).
Mayeul Arminjon (Laboratoire Sols-Solides-Structures, Grenoble).
Daniel Asimov.
Magd Kahil (Mathematics Department, The American University in Cairo).
György Szondy.
Joseph Voros (Swinburne University of Technology).
Germain Rousseaux (Chimie-Physique, Université Libre de Bruxelles).
Robert S. Fritzius.
Mofazzal Azam.
Herbert Winful (Electrical Engineering and Computer Science, U of Michigan).
Robert A. Van Wesep.
Wolfgang Graf (Institut für Theoretische Physik der Universität Wien).
Andre Gsponer (ISRI, Oxford).
Mark D. Roberts (Institut des Hautes Études Scientifiques).
Jae-Weon Lee (School of Computational science, KIAS, Korea).
Tomas Liko.