||A few minor bugs fixed.
||various minor bug fixes; "see also" links added; Greek symbol are replaced by unicode representations to be compatible to modern browsers
||various minor bug fixes; index improved
||Simulation of Lenses and Simulation of Atomic Spectra added; improved index; more "see also" references; biographies of Galileo Galilei, Isaac Newton, Georg Simon Ohm, Joseph John Thomson and Werner Heisenberg added; various spelling errors fixed; ebook is now available as zip archive to avoid security problems.
||New chapter on Newtonian physics added; page about natural isotopes and Albert Einstein added
||New chapter Modern Physics available; correction of the Creative Commons License type (wrong license type was included by mistake, we apologize for any misleading statements).
||Four of the six books are now available online: Conservation Laws, Vibration and Waves, Electricity, and Optics
||About 50% of the original textbook is available. Several additional sections, images and simulations have been incorporated into the original text.
||First implementation of parts of the entire textbook. The rest of the textbook will be made available subsequently.