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BOOK EXCERPT:
The study of finite subgroups of a simple algebraic group $G$ reduces in a sense to those which are almost simple. If an almost simple subgroup of $G$ has a socle which is not isomorphic to a group of Lie type in the underlying characteristic of $G$, then the subgroup is called non-generic. This paper considers non-generic subgroups of simple algebraic groups of exceptional type in arbitrary characteristic.
Product Details :
Genre |
: Mathematics |
Author |
: Alastair J. Litterick |
Publisher |
: American Mathematical Soc. |
Release |
: 2018-05-29 |
File |
: 168 Pages |
ISBN-13 |
: 9781470428372 |
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BOOK EXCERPT:
This paper is a contribution to the study of the subgroup structure of excep-tional algebraic groups over algebraically closed fields of arbitrary characteristic. Following Serre, a closed subgroup of a semisimple algebraic group G is called irreducible if it lies in no proper parabolic subgroup of G. In this paper we com-plete the classification of irreducible connected subgroups of exceptional algebraic groups, providing an explicit set of representatives for the conjugacy classes of such subgroups. Many consequences of this classification are also given. These include results concerning the representations of such subgroups on various G-modules: for example, the conjugacy classes of irreducible connected subgroups are determined by their composition factors on the adjoint module of G, with one exception. A result of Liebeck and Testerman shows that each irreducible connected sub-group X of G has only finitely many overgroups and hence the overgroups of X form a lattice. We provide tables that give representatives of each conjugacy class of connected overgroups within this lattice structure. We use this to prove results concerning the subgroup structure of G: for example, when the characteristic is 2, there exists a maximal connected subgroup of G containing a conjugate of every irreducible subgroup A1 of G.
Product Details :
Genre |
: Education |
Author |
: Adam R. Thomas |
Publisher |
: American Mathematical Soc. |
Release |
: 2021-06-18 |
File |
: 191 Pages |
ISBN-13 |
: 9781470443375 |
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BOOK EXCERPT:
View the abstract.
Product Details :
Genre |
: Mathematics |
Author |
: David A. Craven |
Publisher |
: American Mathematical Society |
Release |
: 2022-04-08 |
File |
: 168 Pages |
ISBN-13 |
: 9781470451196 |
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BOOK EXCERPT:
This volume contains 19 articles written by speakers at the Advanced Study Institute on 'Modular representations and subgroup structure of al gebraic groups and related finite groups' held at the Isaac Newton Institute, Cambridge from 23rd June to 4th July 1997. We acknowledge with gratitude the financial support given by the NATO Science Committee to enable this ASI to take place. Generous financial support was also provided by the European Union. We are also pleased to acknowledge funds given by EPSRC to the Newton Institute which were used to support the meeting. It is a pleasure to thank the Director of the Isaac Newton Institute, Professor Keith Moffatt, and the staff of the Institute for their dedicated work which did so much to further the success of the meeting. The editors wish to thank Dr. Ross Lawther and Dr. Nick Inglis most warmly for their help in the production of this volume. Dr. Lawther in particular made an invaluable contribution in preparing the volume for submission to the publishers. Finally we wish to thank the distinguished speakers at the ASI who agreed to write articles for this volume based on their lectures at the meet ing. We hope that the volume will stimulate further significant advances in the theory of algebraic groups.
Product Details :
Genre |
: Mathematics |
Author |
: R.W. Carter |
Publisher |
: Springer Science & Business Media |
Release |
: 2012-12-06 |
File |
: 388 Pages |
ISBN-13 |
: 9789401153089 |
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BOOK EXCERPT:
The author analyzes the abstract structure of algebraic groups over an algebraically closed field . For of characteristic zero and a given connected affine algebraic Q -group, the main theorem describes all the affine algebraic Q -groups such that the groups and are isomorphic as abstract groups. In the same time, it is shown that for any two connected algebraic Q -groups and , the elementary equivalence of the pure groups and implies that they are abstractly isomorphic. In the final section, the author applies his results to characterize the connected algebraic groups, all of whose abstract automorphisms are standard, when is either Q or of positive characteristic. In characteristic zero, a fairly general criterion is exhibited.
Product Details :
Genre |
: Mathematics |
Author |
: Olivier Frécon |
Publisher |
: American Mathematical Soc. |
Release |
: 2018-10-03 |
File |
: 112 Pages |
ISBN-13 |
: 9781470429232 |
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BOOK EXCERPT:
The automorphisms of a two-generator free group F acting on the space of orientation-preserving isometric actions of F on hyperbolic 3-space defines a dynamical system. Those actions which preserve a hyperbolic plane but not an orientation on that plane is an invariant subsystem, which reduces to an action of a group on by polynomial automorphisms preserving the cubic polynomial and an area form on the level surfaces .
Product Details :
Genre |
: Mathematics |
Author |
: William Goldman |
Publisher |
: American Mathematical Soc. |
Release |
: 2019-06-10 |
File |
: 92 Pages |
ISBN-13 |
: 9781470436148 |
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BOOK EXCERPT:
Over the past 20 years, the theory of groups in particular simplegroups, finite and algebraic has influenced a number of diverseareas of mathematics. Such areas include topics where groups have beentraditionally applied, such as algebraic combinatorics, finitegeometries, Galois theory and permutation groups, as well as severalmore recent developments.
Product Details :
Genre |
: Mathematics |
Author |
: A. A. Ivanov |
Publisher |
: World Scientific |
Release |
: 2003 |
File |
: 350 Pages |
ISBN-13 |
: 9812564489 |
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BOOK EXCERPT:
Given n general points p1,p2,…,pn∈Pr, it is natural to ask when there exists a curve C⊂Pr, of degree d and genus g, passing through p1,p2,…,pn. In this paper, the authors give a complete answer to this question for curves C with nonspecial hyperplane section. This result is a consequence of our main theorem, which states that the normal bundle NC of a general nonspecial curve of degree d and genus g in Pr (with d≥g+r) has the property of interpolation (i.e. that for a general effective divisor D of any degree on C, either H0(NC(−D))=0 or H1(NC(−D))=0), with exactly three exceptions.
Product Details :
Genre |
: Mathematics |
Author |
: Atanas Atanasov |
Publisher |
: American Mathematical Soc. |
Release |
: 2019-02-21 |
File |
: 118 Pages |
ISBN-13 |
: 9781470434892 |
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BOOK EXCERPT:
The author studies high energy resonances for the operators where is strictly convex with smooth boundary, may depend on frequency, and is the surface measure on .
Product Details :
Genre |
: Science |
Author |
: Jeffrey Galkowski |
Publisher |
: American Mathematical Soc. |
Release |
: 2019-06-10 |
File |
: 168 Pages |
ISBN-13 |
: 9781470435721 |
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BOOK EXCERPT:
Conformal nets provide a mathematical model for conformal field theory. The authors define a notion of defect between conformal nets, formalizing the idea of an interaction between two conformal field theories. They introduce an operation of fusion of defects, and prove that the fusion of two defects is again a defect, provided the fusion occurs over a conformal net of finite index. There is a notion of sector (or bimodule) between two defects, and operations of horizontal and vertical fusion of such sectors. The authors' most difficult technical result is that the horizontal fusion of the vacuum sectors of two defects is isomorphic to the vacuum sector of the fused defect. Equipped with this isomorphism, they construct the basic interchange isomorphism between the horizontal fusion of two vertical fusions and the vertical fusion of two horizontal fusions of sectors.
Product Details :
Genre |
: Mathematics |
Author |
: Arthur Bartels |
Publisher |
: American Mathematical Soc. |
Release |
: 2019-04-10 |
File |
: 114 Pages |
ISBN-13 |
: 9781470435233 |