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Author: A. Bialynicki-Birula
Publisher: Springer Science & Business Media
ISBN: 3662050714
Category : Mathematics
Languages : en
Pages : 248
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Book Description
This is the second volume of the new subseries "Invariant Theory and Algebraic Transformation Groups". The aim of the survey by A. Bialynicki-Birula is to present the main trends and achievements of research in the theory of quotients by actions of algebraic groups. This theory contains geometric invariant theory with various applications to problems of moduli theory. The contribution by J. Carrell treats the subject of torus actions on algebraic varieties, giving a detailed exposition of many of the cohomological results one obtains from having a torus action with fixed points. Many examples, such as toric varieties and flag varieties, are discussed in detail. W.M. McGovern studies the actions of a semisimple Lie or algebraic group on its Lie algebra via the adjoint action and on itself via conjugation. His contribution focuses primarily on nilpotent orbits that have found the widest application to representation theory in the last thirty-five years.
Author: A. Bialynicki-Birula
Publisher: Springer Science & Business Media
ISBN: 3662050714
Category : Mathematics
Languages : en
Pages : 248
Get Book
Book Description
This is the second volume of the new subseries "Invariant Theory and Algebraic Transformation Groups". The aim of the survey by A. Bialynicki-Birula is to present the main trends and achievements of research in the theory of quotients by actions of algebraic groups. This theory contains geometric invariant theory with various applications to problems of moduli theory. The contribution by J. Carrell treats the subject of torus actions on algebraic varieties, giving a detailed exposition of many of the cohomological results one obtains from having a torus action with fixed points. Many examples, such as toric varieties and flag varieties, are discussed in detail. W.M. McGovern studies the actions of a semisimple Lie or algebraic group on its Lie algebra via the adjoint action and on itself via conjugation. His contribution focuses primarily on nilpotent orbits that have found the widest application to representation theory in the last thirty-five years.
Author: Tracy O'Neill
Publisher: Soho Press
ISBN: 1641291125
Category : Fiction
Languages : en
Pages : 392
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Book Description
Two people search for connection in a world of fractured identities and aliases, global finance, big data, intelligence bureaucracies, algorithmic logic, and terror. Jeremy Jordan and Alexandra Chen hope to make a quiet home together but struggle to find a space safe from their personal secrets. For Jeremy, this means leaving behind his former life as an intelligence operative during The Troubles in Northern Ireland. For Alexandra, a high-powered job in image management for whole countries cannot prepare her for her missing brother’s sudden reappearance. In a culture of limitless surveillance, Jeremy and Alexandra will go to great lengths to protect what is closest to them. Spanning decades and continents, their saga brings them into contact with a down-and-out online journalist, shadowy security professionals, and jockeying technology experts, each of whom has a different understanding of whether information really protects us, and how we might build a world worth trusting in our paranoid age.
Author: Ilijas Farah
Publisher: American Mathematical Soc.
ISBN: 0821821172
Category : Algebra, Boolean
Languages : en
Pages : 201
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Book Description
This book is intended for graduate students and research mathematicians interested in set theory.
Author: Ines Kath
Publisher: American Mathematical Soc.
ISBN: 1470441039
Category : Education
Languages : en
Pages : 84
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Book Description
Indecomposable symmetric Lorentzian manifolds of non-constant curvature are called Cahen-Wallach spaces. Their isometry classes are described by continuous families of real parameters. The authors derive necessary and sufficient conditions for the existence of compact quotients of Cahen-Wallach spaces in terms of these parameters.
Author: B. Stenström
Publisher: Springer Science & Business Media
ISBN: 3642660665
Category : Mathematics
Languages : en
Pages : 319
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Book Description
The theory of rings of quotients has its origin in the work of (j). Ore and K. Asano on the construction of the total ring of fractions, in the 1930's and 40's. But the subject did not really develop until the end of the 1950's, when a number of important papers appeared (by R. E. Johnson, Y. Utumi, A. W. Goldie, P. Gabriel, J. Lambek, and others). Since then the progress has been rapid, and the subject has by now attained a stage of maturity, where it is possible to make a systematic account of it (which is the purpose of this book). The most immediate example of a ring of quotients is the field of fractions Q of a commutative integral domain A. It may be characterized by the two properties: (i) For every qEQ there exists a non-zero SEA such that qSEA. (ii) Q is the maximal over-ring of A satisfying condition (i). The well-known construction of Q can be immediately extended to the case when A is an arbitrary commutative ring and S is a multiplicatively closed set of non-zero-divisors of A. In that case one defines the ring of fractions Q = A [S-l] as consisting of pairs (a, s) with aEA and SES, with the declaration that (a, s)=(b, t) if there exists UES such that uta = usb. The resulting ring Q satisfies (i), with the extra requirement that SES, and (ii).
Author: Gerald E. Hoyer
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 24
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Book Description
De procedure van de Duitser Hohenadl voor het bepalen van vormquotienten (afgeleid van diverse stamdiameters) en de boominhoud (ook afgeleid van stamdiameters op vastgestelde hoogtes) wordt behandeld. De procedure in gewijzigde vormen werd toegepast op gegevens van de Tsuga hetrophylla. De beschreven procedure blijkt ook voor andere boomsoorten toepasbaar
Author: N.P. Landsman
Publisher: Birkhäuser
ISBN: 3034883641
Category : Mathematics
Languages : en
Pages : 360
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Book Description
This is the first exposition of the quantization theory of singular symplectic (Marsden-Weinstein) quotients and their applications to physics. The reader will acquire an introduction to the various techniques used in this area, as well as an overview of the latest research approaches. These involve classical differential and algebraic geometry, as well as operator algebras and noncommutative geometry. Thus one will be amply prepared to follow future developments in this field.
Author: Bruce Hunt
Publisher: Springer
ISBN: 354069997X
Category : Mathematics
Languages : en
Pages : 347
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Book Description
The book discusses a series of higher-dimensional moduli spaces, of abelian varieties, cubic and K3 surfaces, which have embeddings in projective spaces as very special algebraic varieties. Many of these were known classically, but in the last chapter a new such variety, a quintic fourfold, is introduced and studied. The text will be of interest to all involved in the study of moduli spaces with symmetries, and contains in addition a wealth of material which has been only accessible in very old sources, including a detailed presentation of the solution of the equation of 27th degree for the lines on a cubic surface.
Author: Victor Reiner
Publisher: American Mathematical Soc.
ISBN: 0821825259
Category : Mathematics
Languages : en
Pages : 134
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Book Description
This is a study of some of the combinatorial and topological properties of finite Coxeter complexes. The author begins by studying some of the general topological and algebraic properties of quotients of Coxeter complexes, and determines when they are pseudomanifolds (with or without boundary) and when they are Cohen-Macaulay or Gorenstein over a field. The paper also examines quotients of Coxeter complexes by cyclic subgroups generated by Coxeter elements.
Author: Harry Perkins Cooper
Publisher:
ISBN:
Category : Intelligence tests
Languages : en
Pages : 138
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Book Description
