A.D. Alexandrov

Zusatztext "This classic is quite readable and opens a deeper understanding of this field also through self-study without any special prerequisites ?" - H. Rindler! Wien! in Monatshefte für Mathematik! Vol. 149! No. 4! 2006 Informationen zum Autor S.S. Kutateladze Klappentext A.D. Alexandrov's contribution to the field of intrinsic geometry was original and very influential. This text is a classic that remains unsurpassed in its clarity and scope. It presents his core material! originally published in Russian in 1948! beginning wth an outline of the main concepts and then exploring other topics! such as general propositions on an intrinsic metric; angles and curvature; existence of a convex polyhedron with prescribed metric; curves on convex surfaces; and the role of specific curvature. This text provides Adefinitive source for the development of intrinsic geometry and is indispensable for graduate students who want a better understanding of this subject. Zusammenfassung Published in English for the first time, this is the second part of a two volume set containing an extensive range of the most important papers by the geometer A.D. Alexandrov. Inhaltsverzeichnis BASIC CONCEPTS AND RESULTS The General Concept of Intrinsic Geometry and Its Problems Gaussian Intrinsic Geometry A Polyhedral Metric Development Passage from Polyhedra to Arbitrary Surfaces A Manifold with Intrinsic Metric Basic Concepts of Intrinsic Geometry Curvature Characteristic Properties of the Intrinsic Metric of a Convex Surface Some Special Features of Intrinsic Geometry Theorems of Intrinsic Geometry of Convex Surfaces General Propositions about the Intrinsic Metric General Theorems on Rectifiable Curves General Theorems on Shortest Arcs Nonoverlapping Condition for Shortest Arcs A Convex Neighborhood General Properties of Convex Domains Triangulation CHARACTERISTIC PROPERTIES OF THE INTRINSIC METRIC Convergence of Metrics of Convergent Convex Surfaces Convexity Condition for a Polyhedral Metric Convexity Condition for the Metric of a Convex Surface Consequences of the Convexity Condition ANGLE General Theorems on Addition of Angles Theorems on Addition of Angles on Convex Surfaces The Angle of a Sector Bounded by Shortest Arcs On Convergence of Angles The Tangent Cone The Spatial Meaning of the Angle Between Shortest Arcs CURVATURE Intrinsic Curvature Area of the Spherical Image Generalization of the Gauss Theorem Curvature of Borel Sets Set of Directions in Which It Is Impossible to Draw a Shortest Arc Curvature as a Measure of Non-Euclidicity of Space EXISTENCE OF A CONVEX POLYHEDRON WITH A GIVEN METRIC On Determination of a Metric from a Development The Idea of the Proof of the Realization Theorem Small Deformations of a Polyhedron Deformation of a Convex Polyhedral Angle Rigidity Theorem Realizability of the Metrics That Are Close to the Realized Metrics Smooth Passage from a Given Metric to a Realizable Metric Proof of the Realization Theorem EXISTENCE OF A CLOSED CONVEX SURFACE WITH A GIVEN METRIC The Result and the Method of Proof The Main Lemma on Convex Triangles Consequences of the Main Lemma on Convex Triangles The Complete Angle at a Point Curvature and Two Related Estimates Approximation of a Metric of Positive Curvature Realization of a Metric of Positive Curvature Given on the Sphere OTHER EXISTENCE THEOREMS Glueing Theorem Application of the Glueing Theorem to the Realization Theorems Realizability of a Complete Metric of Positive Curvature Manifolds on Which a Metric of Positive Curvature Can Be Given Uniqueness of a Convex Surface Various Definitions of a Metric of Positive Curvature CURVES ON CONVEX SURFACES The Direction of a Curve The Swerve of a Curve General Glueing Theorem Convex Domains Quasigeodesics A Circle AREA The Intrinsic Definition of Area The Extrinsic-Geometric Meaning of Area Ex...

Autorentext
S.S. Kutateladze

Klappentext
A.D. Alexandrov's contribution to the field of intrinsic geometry was original and very influential. This text is a classic that remains unsurpassed in its clarity and scope. It presents his core material, originally published in Russian in 1948, beginning wth an outline of the main concepts and then exploring other topics, such as general propositions on an intrinsic metric; angles and curvature; existence of a convex polyhedron with prescribed metric; curves on convex surfaces; and the role of specific curvature. This text provides Adefinitive source for the development of intrinsic geometry and is indispensable for graduate students who want a better understanding of this subject.


Zusammenfassung
Published in English for the first time, this is the second part of a two volume set containing an extensive range of the most important papers by the geometer A.D. Alexandrov.

Inhalt
Basic Concepts and Results. General Propositions about the Intrinsic Metric. Characteristic Properties of the Intrinsic Metric. Angle. Curvature. Existence of a Convex Polyhedron with a Given Metric. Existence of a Closed Convex Surface with a Given Metric. Other Existence Theorems. Curves on Convex Surfaces. Area. The Role of the Specific Curvature. Generalization. Appendix. Basic Facts of Convex Bodies.

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