Mathmensch

DEBEMUS COGNOSCERE COGNOSCEMUSQUE

Personal information
This user studies at the Karlsruhe Institute of Technology. BSc This user holds a Bachelor of Science degree. This user plays chess. This user plays the piano.

Hello, this is Mathmensch. Having been banned from two Wikipediae, I now mainly write wikibooks. You may contact me on any of my talk pages, but if you have a comment regarding a particular project, it probably makes sense to use the talk page on that very project.

My collection of multi-alphabet keyboards

You may visit a printing store and have them printed on an A4 sheet of sticky paper. (The keys will be the correct size, but you have to cut the sheet yourself.)

Latin, Cyrillic and Devanagari

Greek, Hebrew and Arabic

Hangul, Hiragana and Farsi

My favourite pictures

• 
  Saw mill of Marcus Aurelius Ammianos
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  Construction of a parallelogram with ruler and compass
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  Some ordinal numbers
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  The decomposition of octane into butane and butene
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  The axial tilts (aka obliquity) of the earth and the moon
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  The so-called "Dandelin spheres" that prove that a closed conic section is an ellipse
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  Alhazen's geometrical proof of the formula for the sum of the first n numbers