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Book
The Structure of Affine Buildings. (AM-168)
Author:
ISBN: 9780691136592 0691136599 9780691138817 0691138818 9786612458361 1282458361 1400829054 9781400829057 9781282458369 6612458364 Year: 2008 Volume: 168 Publisher: Princeton, NJ

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Abstract

In The Structure of Affine Buildings, Richard Weiss gives a detailed presentation of the complete proof of the classification of Bruhat-Tits buildings first completed by Jacques Tits in 1986. The book includes numerous results about automorphisms, completions, and residues of these buildings. It also includes tables correlating the results in the locally finite case with the results of Tits's classification of absolutely simple algebraic groups defined over a local field. A companion to Weiss's The Structure of Spherical Buildings, The Structure of Affine Buildings is organized around the classification of spherical buildings and their root data as it is carried out in Tits and Weiss's Moufang Polygons.

Keywords

Buildings (Group theory) --- Moufang loops --- Automorphisms --- Affine algebraic groups --- Moufang loops. --- Automorphisms. --- Affine algebraic groups. --- Algebraic groups, Affine --- Loops, Moufang --- Theory of buildings (Group theory) --- Tits's theory of buildings (Group theory) --- Group schemes (Mathematics) --- Group theory --- Symmetry (Mathematics) --- Loops (Group theory) --- Linear algebraic groups --- Buildings (Group theory). --- Addition. --- Additive group. --- Additive inverse. --- Algebraic group. --- Algebraic structure. --- Ambient space. --- Associative property. --- Automorphism. --- Big O notation. --- Bijection. --- Bilinear form. --- Bounded set (topological vector space). --- Bounded set. --- Calculation. --- Cardinality. --- Cauchy sequence. --- Commutative property. --- Complete graph. --- Complete metric space. --- Composition algebra. --- Connected component (graph theory). --- Consistency. --- Continuous function. --- Coordinate system. --- Corollary. --- Coxeter group. --- Coxeter–Dynkin diagram. --- Diagram (category theory). --- Diameter. --- Dimension. --- Discrete valuation. --- Division algebra. --- Dot product. --- Dynkin diagram. --- E6 (mathematics). --- E7 (mathematics). --- E8 (mathematics). --- Empty set. --- Equipollence (geometry). --- Equivalence class. --- Equivalence relation. --- Euclidean geometry. --- Euclidean space. --- Existential quantification. --- Free monoid. --- Fundamental domain. --- Hyperplane. --- Infimum and supremum. --- Jacques Tits. --- K0. --- Linear combination. --- Mathematical induction. --- Metric space. --- Multiple edges. --- Multiplicative inverse. --- Number theory. --- Octonion. --- Parameter. --- Permutation group. --- Permutation. --- Pointwise. --- Polygon. --- Projective line. --- Quadratic form. --- Quaternion. --- Remainder. --- Root datum. --- Root system. --- Scientific notation. --- Sphere. --- Subgroup. --- Subring. --- Subset. --- Substructure. --- Theorem. --- Topology of uniform convergence. --- Topology. --- Torus. --- Tree (data structure). --- Tree structure. --- Two-dimensional space. --- Uniform continuity. --- Valuation (algebra). --- Vector space. --- Without loss of generality.


Book
Classification of pseudo-reductive groups
Authors: ---
ISBN: 1400874025 Year: 2016 Publisher: Princeton, New Jersey ; Oxford, England : Princeton University Press,

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Abstract

In the earlier monograph Pseudo-reductive Groups, Brian Conrad, Ofer Gabber, and Gopal Prasad explored the general structure of pseudo-reductive groups. In this new book, Classification of Pseudo-reductive Groups, Conrad and Prasad go further to study the classification over an arbitrary field. An isomorphism theorem proved here determines the automorphism schemes of these groups. The book also gives a Tits-Witt type classification of isotropic groups and displays a cohomological obstruction to the existence of pseudo-split forms. Constructions based on regular degenerate quadratic forms and new techniques with central extensions provide insight into new phenomena in characteristic 2, which also leads to simplifications of the earlier work. A generalized standard construction is shown to account for all possibilities up to mild central extensions. The results and methods developed in Classification of Pseudo-reductive Groups will interest mathematicians and graduate students who work with algebraic groups in number theory and algebraic geometry in positive characteristic.

Keywords

Linear algebraic groups. --- Group theory. --- Geometry, Algebraic. --- Algebraic geometry --- Geometry --- Groups, Theory of --- Substitutions (Mathematics) --- Algebra --- Algebraic groups, Linear --- Geometry, Algebraic --- Group theory --- Algebraic varieties --- "ient homomorphism. --- Cartan k-subgroup. --- Dynkin diagram. --- Isogeny Theorem. --- Isomorphism Theorem. --- Levi subgroup. --- SeveriЂrauer variety. --- Tits classification. --- Tits-style classification. --- Weil restriction. --- algebraic geometry. --- automorphism functor. --- automorphism scheme. --- automorphism. --- canonical central extensions. --- central "ient. --- central extension. --- characteristic 2. --- conformal isometry. --- degenerate quadratic form. --- double bond. --- exotic construction. --- field-theoretic invariant. --- generalized exotic group. --- generalized standard group. --- generalized standard presentation. --- generalized standard. --- isomorphism class. --- isomorphism. --- isotropic group. --- k-tame central extension. --- linear isomorphism. --- linear-algebraic invariant. --- maximal torus. --- minimal type. --- non-reduced root system. --- number theory. --- pseudo-isogeny. --- pseudo-reductive group. --- pseudo-semisimple group. --- pseudo-simple group. --- pseudo-simple k-group. --- pseudo-split form. --- pseudo-split. --- quadratic space. --- quadrics. --- rank-1. --- rank-2. --- rigidity property. --- root field. --- root system. --- scheme-theoretic center. --- semisimple "ient. --- semisimple k-group. --- structure theorem.

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