Other Contributors

I gratefully acknowledge the contributions of:

Prof. A. Gotsman, Physics, Tel Aviv University, for correcting my English.
Prof. G. Levin and Prof. M. Karliner, Physics, Tel Aviv University, for encourangement.
Dr. Nir Dagan, for helping me with the publication.
Andrea Leofreddi, for the javascript program, of panning and zooming SVG.
Contributors to the browsers Firefox, Safari, Chrome and Opera.
Contributors to Math Type, for making possible the use of MathML.