Mathmensch
Joined 8 June 2013
DEBEMUS COGNOSCERE COGNOSCEMUSQUE
Personal information  


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 multialphabet keyboards
editYou 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.)
My favourite pictures
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Saw mill of Marcus Aurelius Ammianos

Construction of a parallelogram with ruler and compass

Some ordinal numbers

The decomposition of octane into butane and butene

The axial tilts (aka obliquity) of the earth and the moon

The socalled "Dandelin spheres" that prove that a closed conic section is an ellipse

Alhazen's geometrical proof of the formula for the sum of the first n numbers