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Schläfli symbol
Notation that defines regular polytopes and tessellations / From Wikipedia, the free encyclopedia
In geometry, the Schläfli symbol is a notation of the form that defines regular polytopes and tessellations.
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The Schläfli symbol is named after the 19th-century Swiss mathematician Ludwig Schläfli,[1]: 143 who generalized Euclidean geometry to more than three dimensions and discovered all their convex regular polytopes, including the six that occur in four dimensions.