Two-dimensional Manifolds of Bounded Curvature

Two-dimensional Manifolds of Bounded Curvature PDF Author: Aleksandr Danilovich Aleksandrov
Publisher: American Mathematical Soc.
ISBN: 9780821818763
Category : Mathematics
Languages : en
Pages : 198

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Book Description
Proceedings and papers about in which the foundation of the intrinsic geometry of nonregular surfaces is developed.

Two-dimensional Manifolds of Bounded Curvature

Two-dimensional Manifolds of Bounded Curvature PDF Author: Aleksandr Danilovich Aleksandrov
Publisher: American Mathematical Soc.
ISBN: 9780821818763
Category : Mathematics
Languages : en
Pages : 198

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Book Description
Proceedings and papers about in which the foundation of the intrinsic geometry of nonregular surfaces is developed.

Reshetnyak's Theory of Subharmonic Metrics

Reshetnyak's Theory of Subharmonic Metrics PDF Author: François Fillastre
Publisher: Springer Nature
ISBN: 3031242556
Category : Mathematics
Languages : en
Pages : 389

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Book Description
Despite the fundamental role played by Reshetnyak's work in the theory of surfaces of bounded integral curvature, the proofs of his results were only available in his original articles, written in Russian and often hard to find. This situation used to be a serious problem for experts in the field. This book provides English translations of the full set of Reshetnyak's articles on the subject. Together with the companion articles, this book provides an accessible and comprehensive reference for the subject. In turn, this book should concern any researcher (confirmed or not) interested in, or active in, the field of bounded integral curvature surfaces, or more generally interested in surface geometry and geometric analysis. Due to the analytic nature of Reshetnyak's approach, it appears that his articles are very accessible for a modern audience, comparing to the works using a more synthetic approach. These articles of Reshetnyak concern more precisely the work carried by the author following the completion of his PhD thesis, under the supervision of A.D. Alexandrov. Over the period from the 1940’s to the 1960’s, the Leningrad School of Geometry, developed a theory of the metric geometry of surfaces, similar to the classical theory of Riemannian surfaces, but with lower regularity, allowing greater flexibility. Let us mention A.D. Alexandrov, Y.D. Burago and V.A. Zalgaller. The types of surfaces studied by this school are now known as surfaces of bounded curvature. Particular cases are that of surfaces with curvature bounded from above or below, the study of which gained special attention after the works of M. Gromov and G. Perelman. Nowadays, these concepts have been generalized to higher dimensions, to graphs, and so on, and the study of metrics of weak regularity remains an active and challenging field. Reshetnyak developed an alternative and analytic approach to surfaces of bounded integral curvature. The underlying idea is based on the theorem of Gauss which states that every Riemannian surface is locally conformal to Euclidean space. Reshetnyak thus studied generalized metrics which are locally conformal to the Euclidean metric with conformal factor given by the logarithm of the difference between two subharmonic functions on the plane. Reshetnyak's condition appears to provide the correct regularity required to generalize classical concepts such as measure of curvature, integral geodesic curvature for curves, and so on, and in turn, to recover surfaces of bounded curvature. Chapter-No.7, Chapter-No.8, Chapter-No.12 and Chapter-No.13 are available open access under Creative Commons Attribution-NonCommercial 4.0 International License via link.springer.com.

Geometry IV

Geometry IV PDF Author: Yu.G. Reshetnyak
Publisher: Springer Science & Business Media
ISBN: 3662028972
Category : Mathematics
Languages : en
Pages : 256

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Book Description
This book contains two surveys on modern research into non-regular Riemannian geometry, carried out mostly by Russian mathematicians. Coverage examines two-dimensional Riemannian manifolds of bounded curvature and metric spaces whose curvature lies between two given constants. This book will be immensely useful to graduate students and researchers in geometry, in particular Riemannian geometry.

Geometry III

Geometry III PDF Author: Yu.D. Burago
Publisher: Springer Science & Business Media
ISBN: 3662027518
Category : Mathematics
Languages : en
Pages : 263

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Book Description
A volume devoted to the extremely clear and intrinsically beautiful theory of two-dimensional surfaces in Euclidean spaces. The main focus is on the connection between the theory of embedded surfaces and two-dimensional Riemannian geometry, and the influence of properties of intrinsic metrics on the geometry of surfaces.

Encyclopaedia of Mathematics

Encyclopaedia of Mathematics PDF Author: Michiel Hazewinkel
Publisher: Springer Science & Business Media
ISBN: 1556080085
Category : Mathematics
Languages : en
Pages : 556

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Book Description
This ENCYCLOPAEDIA OF MATHEMATICS aims to be a reference work for all parts of mathe matics. It is a translation with updates and editorial comments of the Soviet Mathematical Encyclopaedia published by 'Soviet Encyclopaedia Publishing House' in five volumes in 1977-1985. The annotated translation consists of ten volumes including a special index volume. There are three kinds of articles in this ENCYCLOPAEDIA. First of all there are survey-type articles dealing with the various main directions in mathematics (where a rather fme subdivi sion has been used). The main requirement for these articles has been that they should give a reasonably complete up-to-date account of the current state of affairs in these areas and that they should be maximally accessible. On the whole, these articles should be understandable to mathematics students in their first specialization years, to graduates from other mathematical areas and, depending on the specific subject, to specialists in other domains of science, en gineers and teachers of mathematics. These articles treat their material at a fairly general level and aim to give an idea of the kind of problems, techniques and concepts involved in the area in question. They also contain background and motivation rather than precise statements of precise theorems with detailed definitions and technical details on how to carry out proofs and constructions. The second kind of article, of medium length, contains more detailed concrete problems, results and techniques.

Geometry IV

Geometry IV PDF Author: Yurĭi Grigorevǐc Reshetnyak
Publisher: Springer Science & Business Media
ISBN: 9783540547013
Category : Mathematics
Languages : en
Pages : 274

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Book Description
This book contains two surveys on modern research into non-regular Riemannian geometry, carried out mostly by Russian mathematicians. Coverage examines two-dimensional Riemannian manifolds of bounded curvature and metric spaces whose curvature lies between two given constants. This book will be immensely useful to graduate students and researchers in geometry, in particular Riemannian geometry.

An Invitation to Alexandrov Geometry

An Invitation to Alexandrov Geometry PDF Author: Stephanie Alexander
Publisher: Springer
ISBN: 3030053121
Category : Mathematics
Languages : en
Pages : 95

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Book Description
Aimed toward graduate students and research mathematicians, with minimal prerequisites this book provides a fresh take on Alexandrov geometry and explains the importance of CAT(0) geometry in geometric group theory. Beginning with an overview of fundamentals, definitions, and conventions, this book quickly moves forward to discuss the Reshetnyak gluing theorem and applies it to the billiards problems. The Hadamard–Cartan globalization theorem is explored and applied to construct exotic aspherical manifolds.

Extrinsic Geometry of Convex Surfaces

Extrinsic Geometry of Convex Surfaces PDF Author: Alekseĭ Vasilʹevich Pogorelov
Publisher: American Mathematical Soc.
ISBN: 9780821886618
Category : Mathematics
Languages : en
Pages : 680

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Book Description


Siberian Mathematical Journal

Siberian Mathematical Journal PDF Author:
Publisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 1052

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Book Description


Convex Analysis and Nonlinear Geometric Elliptic Equations

Convex Analysis and Nonlinear Geometric Elliptic Equations PDF Author: Ilya J. Bakelman
Publisher: Springer Science & Business Media
ISBN: 3642698816
Category : Mathematics
Languages : en
Pages : 524

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Book Description
Investigations in modem nonlinear analysis rely on ideas, methods and prob lems from various fields of mathematics, mechanics, physics and other applied sciences. In the second half of the twentieth century many prominent, ex emplary problems in nonlinear analysis were subject to intensive study and examination. The united ideas and methods of differential geometry, topology, differential equations and functional analysis as well as other areas of research in mathematics were successfully applied towards the complete solution of com plex problems in nonlinear analysis. It is not possible to encompass in the scope of one book all concepts, ideas, methods and results related to nonlinear analysis. Therefore, we shall restrict ourselves in this monograph to nonlinear elliptic boundary value problems as well as global geometric problems. In order that we may examine these prob lems, we are provided with a fundamental vehicle: The theory of convex bodies and hypersurfaces. In this book we systematically present a series of centrally significant results obtained in the second half of the twentieth century up to the present time. Particular attention is given to profound interconnections between various divisions in nonlinear analysis. The theory of convex functions and bodies plays a crucial role because the ellipticity of differential equations is closely connected with the local and global convexity properties of their solutions. Therefore it is necessary to have a sufficiently large amount of material devoted to the theory of convex bodies and functions and their connections with partial differential equations.