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Conjugacy of Borel subgroups: An easy proof

✍ Scribed by Moss Eisenberg Sweedler


Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
682 KB
Volume
20
Category
Article
ISSN
0001-8708

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The upper bound theorem for polytopes: a
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Since at least half of the d edges incident to a vertex u of a simple d-polytope P either all point "up" or all point "down," v must be the unique "bottom" or "top" vertex of a face of P of dimension at least d/2. Thus the number of P's vertices is at most twice the number of such high-dimensional f