Mathematics (Description of the most beautiful things on this world ;-) and what I have done during almost ten years)
Mathematical Recreations (Here is a archive of mathematical puzzles I collected throughout the years)
Polyominoes and Other Games (Have fun with polyominoes or try another game!)
Computer Science (Here you can download my programs. Enjoy them!)
Links (including cycling, software archives, journals, libraries, games, science...)
Daniel Lehner
Neunbrunnenstr. 152
CH-8046 Zürich
Tel.: ++41 1 310 36 55
dani70x@freesurf.ch Remove the x from the e-mail address (I don't like spam!)