Karl Reinhardt (mathematician)

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Karl August Reinhardt
Born January 27, 1895 (1895-01-27)
Frankfurt am Main
Died April 27, 1941 (1941-04-28) (aged 46)
Berlin
Nationality German
Occupation Mathematician

Karl August Reinhardt (27 January 1895 Frankfurt am Main – 27 April 1941 Berlin) was a German mathematician who discovered the 5 tile-transitive pentagon tilings, solved the odd case of the biggest little polygon problem, and constructed the smoothed octagon conjectured to be the worst-packing point-symmetric planar convex shape. He also gave a partial solution to Hilbert's eighteenth problem by discovering an anisohedral tiling in three dimensions.

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