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| Mathematics (Description of the most beautiful things on this world ;-) and what I have done during almost ten years) |
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| Mathematical Recreations (Here is a archive of mathematical puzzles I collected throughout the years) |
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| Polyominoes and Other Games (Have fun with polyominoes or try another game!) |
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| Computer Science (Here you can download my programs. Enjoy them!) |
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| Links (including cycling, software archives, journals, libraries, games, science...) |
| Daniel Lehner Neunbrunnenstr. 152 CH-8046 Z�rich Tel.: ++41 1 310 36 55 |
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