Thank you

I am deeply grateful for all the support that I received for the books, the website, and the publications about the strand tangle model. For the research publications, the names are listed in the respective acknowledgements. Passing on the gifts from my parents, my family, and everybody I met is my way to honour what I received. Therefore, this website is free for everybody.

The following volunteers and organizations have supported the book project. Many others have helped but wanted to remain anonymous. Thank you to all of them.

Gold sponsors

Silver sponsors

Bronze sponsors

Iron sponsors

The SchoolTutoring Academy provided a donation in support of better physics education.
The physics resources department at made a donation in 2011.
The physics tutors at made a donation in 2011.
Donations were also provided by Robrecht De Rouck, Virginia Lira, Liliana Alonso and Wolf Tombe and a number of other donors who prefer to be unnamed.

Content: Numerous readers have provided material for this text: a warm thank-you to every one of them. Important material was provided by Bert Peeters, Anna Wierzbicka, William Beaty, Jim Carr, John Merrit, John Baez, Lawrence Bottorff, Frank DiFilippo, Jonathan Scott, Jon Thaler, Luca Bombelli, Douglas Singleton, George McQuarry, Tilman Hausherr, Brian Oberquell, Peer Zalm, Martin van der Mark, Vladimir Surdin, Julia Simon, Antonio Fermani, Don Page, Stephen Haley, Peter Mayr, Allan Hayes, Igor Ivanov, Doug Renselle, Wim de Muynck, Steve Carlip, Tom Bruce, Ryan Budney, Gary Ruben, Chris Hillman, Olivier Glassey, Jochen Greiner, squark, Martin Hardcastle, Mark Biggar, Pavel Kuzin, Douglas Brebner, Luciano Lombardi, Franco Bagnoli, Lukas Fabian Moser, Dejan Corovic, Steve Carlip, Corrado Massa, Tom Helmond, Gary Gibbons, Heinrich Neumaier, Peter Brown, Paul Vannoni, John Haber, Saverio Pascazio, Klaus Finkenzeller, Leo Volin, Jeff Aronson, Roggie Boone, Lawrence Tuppen, Quentin David Jones, Arnaldo Uguzzoni, Frans van Nieuwpoort, Alan Mahoney, Britta Schiller, Petr Danecek, Ingo Thies, Vitaliy Solomatin, Carl Offner, Nuno Proença, Elena Colazingari, Paula Henderson, Daniel Darre, Wolfgang Rankl, John Heumann, Joseph Kiss, Martha Weiss, Antonio González, Antonio Martos, John Heumann, André Slabber, Ferdinand Bautista, Zoltán Gácsi, Pat Furrie, Michael Reppisch, Enrico Pasi, Thomas Köppe, Martin Rivas, Herman Beeksma, Tom Helmond, John Brandes, Vlad Tarko, Nadia Murillo, Ciprian Dobra, Romano Perini, Harald van Lintel, Andrea Conti, François Belfort, Dirk Van de Moortel, Heinrich Neumaier, Jaroslaw Królikowski, John Dahlman, Fathi Namouni, Paul Townsend, Sergei Emelin, Freeman Dyson, S.R.Madhu Rao, David Parks, Jürgen Janek, Daniel Huber, Alfons Buchmann, William Purves, Pietro Redondi, Sergei Kopeikin, Helmut Wunderling, Frank Sweetser, Farooq Ahmad Bhat, plus a number of people who chose to remain unnamed.

Animations and films: All included films are copyrighted; they were kindly provided by Martin Elsässer, Jarmo Hietarinta, Lim Tee Tai, Thomas Weiland, Daniel Schroeder, Roger Sabbadini, Dean Dauger, Greg Egan, Jake Socha, Lucas Barbosa, José Antonio Díaz Navas and Ute Kraus.

Photographs: Almost all photographs, in total more than 200, shown in the text and on the website are copyrighted; permission to use them has been kindly provided by each copyright holder. The names are mentioned below each picture, in the index of names, and on the picture credit page in the appendix.

Software: The textbook was typeset using its own LaTeX class file, the MinionPro package and over 60 existing LaTeX packages, using Gerben Wierda's gwtex distribution, Andrew Trevorrow's OzTeX and TexLive. Numerous limitations and bugs in the tex distribution, in LaTeX, in LaTeX packages, in programming editors, and even in Adobe Acrobat had to be corrected to typeset the text. The software tools were refined with the repeated and valuable support of Donald Arseneau; help came also from Ulrike Fischer, Piet van Oostrum, Gerben Wierda, Klaus Böhncke, Craig Upright, Herbert Voss, Andrew Trevorrow, Danie Els, Sebastian Rahtz, Don Story, Vincent Darley, Johan Linde, Joseph Hertzlinger, Rick Zaccone, John Warkentin, Ulrich Diez, Uwe Siart, Will Robertson, Joseph Wright, Enrico Gregorio, Rolf Niepraschk, Alexander Grahn and Michael Zedler. The beautiful Minion math fonts are those of Johannes Küster; they are found at Typoma.

Website: The programming of the html pages owes much to the help of Greg Smith and Michael Beretka. Chris Garbers helped for the wiki and many other issues. Ipad tests are due to Rick Shoal. The website uses several PHP scripts from the PHPJunkyard and from Phil Connell. Translations of the html pages are due to Daniel Gutmanas, Romano Perini, Matous Ringel, Marek Gajdos, Irwan Prasetya Gunawan, Jarosław Królikowski, Johnny Chadda, Martin Clausen, Dimitar Genchev, Ryan, Kasper Olsen, Helga Trapp, Thomas Wahlstrøm, Gorka Ochoa, Ambrož Demšar, Roman Beslik, Paul Townsend, Kristjan Kannike, Hirooka Megumi, Mahdi Samadzad, Rahele Mashhadiebrahim, Kishan Kumar, Ahmed Bassel Radwan and Dragos Vulovic.

Hardware: Without the excellent and professional service of Gravis in Munich this project could not have been realized.

Colour sponsors

The many readers who sent feedback, suggestions and criticism helped making this text into what it is today. Thank you for the support! You add the colour to this project.

I want to thank also the many software developers who make free tools for book writing: TeX, LaTeX, TextMate, Alpha, Aquamacs, Inkscape, FileZilla, Firefox, Opera.