Jacques Tits; Richard M. Weiss Moufang Polygons 9783642078330

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Автор: Jacques Tits; Richard M. Weiss
Название: Moufang Polygons
ISBN: 9783642078330
Издательство: Springer
Классификация:

Алгебра

Группы и теория групп

Геометрия

Комбинаторика и теория графов

ISBN-10: 3642078338
Обложка/Формат: Paperback
Страницы: 535
Вес: 0.76 кг.
Дата издания: 05.12.2010
Серия: Springer Monographs in Mathematics
Язык: English
Размер: 234 x 156 x 28
Основная тема: Mathematics
Ссылка на Издательство: Link
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Поставляется из: Германии
Описание: Spherical buildings are certain combinatorial simplicial complexes intro- duced, at first in the language of incidence geometries, to provide a sys- tematic geometric interpretation of the exceptional complex Lie groups. (The definition of a building in terms of chamber systems and definitions of the various related notions used in this introduction such as thick, residue, rank, spherical, etc. are given in Chapter 39. ) Via the notion of a BN-pair, the theory turned out to apply to simple algebraic groups over an arbitrary field. More precisely, to any absolutely simple algebraic group of positive rela- tive rank is associated a thick irreducible spherical building of the same rank (these are the algebraic spherical buildings) and the main result of Buildings of Spherical Type and Finite BN-Pairs 101] is that the converse, for:::: 3, is almost true: (1. 1) Theorem. Every thick irreducible spherical building of rank at least three is classical, algebraic or mixed. Classical buildings are those defined in terms of the geometry of a classical group (e. g. unitary, orthogonal, etc. of finite Witt index or linear of finite dimension) over an arbitrary field or skew-field. (These are not algebraic if, for instance, the skew-field is of infinite dimension over its center. ) Mixed buildings are more exotic; they are related to groups which are in some sense algebraic groups defined over a pair of fields k and K of characteristic p, where KP eke K and p is two or (in one case) three.

Moufang Polygons, Jacques Tits; Richard M. Weiss