A diagram of a Klein bottle, one of the many mathematical objects named after German mathematician Felix Klein. Image: Vierkantswortel2, via Wikimedia Commons. I just finished reading a set of lectures the great mathematician Felix Klein delivered at the 1893 World’s Columbian Exposition in Chicago. The lectures are now in the public domain, and you can download them for free here . (Unfortunately, not all the mathematical notation survived d ...
http://blogs.scientificamerican.com/roots-of-unity/2013/12/31/felix-kl
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