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Lectures in real geometry /
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Lectures in real geometry / editor Fabrizio Broglia.
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Bibliographic Details
Other Authors:
Broglia, Fabrizio, 1948-
Format:
eBook
Language:
English
Published:
Berlin ; New York :
Walter de Gruyter,
1996.
Series:
De Gruyter expositions in mathematics ;
23.
Subjects:
Geometry, Analytic.
Geometry, Algebraic.
MATHEMATICS
>
Geometry
>
Algebraic.
Geometry, Algebraic
Geometry, Analytic
Online Access:
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Table of Contents
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Table of Contents:
Foreword
Introduction
Basic algorithms in real algebraic geometry and their complexity: from Sturm�s theorem to the existential theory of reals
1. Introduction
2. Real closed fields
2.1. Definition and first examples of real closed fields
2.2. Cauchy index and real root counting
3. Real root counting
3.1. Sylvester sequence
3.2. Subresultants and remainders
3.3. Sylvester-Habicht sequence
3.4. Quadratic forms, Hankel matrices and real roots
3.5. Summary and discussion
4. Complexity of algorithms
5. Sign determinations
5.1. Simultaneous inequalities5.2. Thom�s lemma and its consequences
6. Existential theory of reals
6.1. Solving multivariate polynomial systems
6.2. Some real algebraic geometry
6.3. Finding points on hypersurfaces
6.4. Finding non empty sign conditions
References
Nash functions and manifolds
Â1. Introduction
Â2. Nash functions
Â3. Approximation Theorem
Â4. Nash manifolds
Â5. Sheaf theory of Nash function germs
Â6. Nash groups
References
Approximation theorems in real analytic and algebraic geometry
IntroductionI. The analytic case
1. The Whitney topology for sections of a sheaf
2. A Whitney approximation theorem
3. Approximation for sections of a sheaf
4. Approximation for sheaf homomorphisms
II. The algebraic case
5. Preliminaries on real algebraic varieties
6. A- and B-coherent sheaves
7. The approximation theorems in the algebraic case
III. Algebraic and analytic bundles
8. Duality theory
9. Strongly algebraic vector bundles
10. Approximation for sections of vector bundles
References
Real abelian varieties and real algebraic curvesIntroduction
1. Generalities on complex tori
1.1. Complex tori
1.2. Homology and cohomology of tori
1.3. Morphisms of complex tori
1.4. The Albanese and the Picard variety
1.5. Line bundles on complex tori
1.6. Polarizations
1.7. Riemann�s bilinear relations and moduli spaces
2. Real structures
2.1. Definition of real structures
2.2. Real models
2.3. The action of conjugation on functions and forms
2.4. The action of conjugation on cohomology
2.5. A theorem of Comessatti2.6. Group cohomology
2.7. The action of conjugation on the Albanese variety and the Picard group
2.8. Period matrices in pseudonormal form and the Albanese map
3. Real abelian varieties
3.1. Real structures on complex tori
3.2. Equivalence classes for real structures on complex tori
3.3. Line bundles on complex tori with a real structure
3.4. Riemann bilinear relations for principally polarized real varieties
3.5. Moduli spaces of principally polarized real abelian varieties
3.6. Real theta functions
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