Coxeter, John Conway and others. There are still many problems to be solved in this area of investigation opened up by Ludwig Schläfli. See also Regular 4-polytope Schläfli double six Schläfli graph Schläfli orthoscheme Schläfli symbol References [Sch] Ludwig Schläfli, Gesammelte Abhandlungen [DSB] Dictionary of Scientific Biographies [ADB] Allgemeine Deutsche Biographie, Band 54, S.29–31. Biography by Moritz Cantor, 1896 [Kas] Abraham Gotthelf Kästner, Mathematische Anfangsgründe der Analysis des Unendlichen, Göttingen, 1761 Note: This is the third volume of Kästner's Mathematische Anfangsgründe, which can be viewed online at the Göttinger Digitalisierungszentrum. External links 19th-century Swiss mathematicians 1814 births 1895 deaths Polytopes University of Bern alumni