Description4 21 t4 p20.svg Quadrirectified en:4_21_polytope in a en:Coxeter plane projection (no edges shown) Date 11/3/10 Source Own work Author self...
philosopher, composer and cartographer Date of birth/death 26 October 1674 21 August 1723 (in Julian calendar) Location of birth/death Dimitrie Cantemir ...
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