User:Mathmensch
DEBEMUS COGNOSCERE COGNOSCEMUSQUE
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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.)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Internationale-tastatur.svg/600px-Internationale-tastatur.svg.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Internationale-tastatur-2.svg/600px-Internationale-tastatur-2.svg.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/77/Internationale-tastatur-3.svg/600px-Internationale-tastatur-3.svg.png)
My favourite pictures
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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