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  • 1
    Book
    Book
    Basel [u.a.] :Birkhäuser,
    UID:
    almahu_BV023077653
    Format: X, 341 S. : , Ill., graph. Darst.
    ISBN: 978-3-7643-8620-7 , 978-3-7643-8621-4
    Series Statement: Oberwolfach seminars 38
    Language: English
    Subjects: Mathematics
    RVK:
    Keywords: Diskrete Geometrie ; Differentialgeometrie ; Konferenzschrift
    URL: Cover
    Author information: Bobenko, Aleksandr I., 1960-
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  • 2
    Book
    Book
    Providence, RI :American Mathematical Society,
    UID:
    almahu_BV035302556
    Format: XXIV, 404 S. : , graph. Darst.
    ISBN: 978-0-8218-4700-8 , 0-8218-4700-7
    Series Statement: Graduate studies in mathematics 98
    Content: An emerging field of discrete differential geometry aims at the development of discrete equivalents of notions and methods of classical differential geometry. The latter appears as a limit of a refinement of the discretization. Current interest in discrete differential geometry derives not only from its importance in pure mathematics but also from its applications in computer graphics, theoretical physics, architecture, and numerics. Rather unexpectedly, the very basic structures of discrete differential geometry turn out to be related to the theory of integrable systems. One of the main goals of this book is to reveal this integrable structure of discrete differential geometry. For a given smooth geometry one can suggest many different discretizations. Which one is the best?This book answers this question by providing fundamental discretization principles and applying them to numerous concrete problems. It turns out that intelligent theoretical discretizations are distinguished also by their good performance in applications. The intended audience of this book is threefold. It is a textbook on discrete differential geometry and integrable systems suitable for a one semester graduate course. On the other hand, it is addressed to specialists in geometry and mathematical physics. It reflects the recent progress in discrete differential geometry and contains many original results.The third group of readers at which this book is targeted is formed by specialists in geometry processing, computer graphics, architectural design, numerical simulations, and animation. They may find here answers to the question 'How do we discretize differential geometry?' arising in their specific field. Prerequisites for reading this book include standard undergraduate background (calculus and linear algebra). No knowledge of differential geometry is expected, although some familiarity with curves and surfaces can be helpful.
    Additional Edition: Erscheint auch als Online-Ausgabe ISBN 978-1-4704-1793-2
    Language: English
    Subjects: Mathematics
    RVK:
    Keywords: Diskrete Geometrie ; Differentialgeometrie
    Author information: Bobenko, Aleksandr I., 1960-
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  • 3
    Book
    Book
    Berlin ; Heidelberg :Springer Open,
    UID:
    almahu_BV043767696
    Format: x, 439 Seiten : , Illustrationen, Diagramme.
    ISBN: 978-3-662-50446-8
    Note: Erscheint als Open Access
    Additional Edition: Erscheint auch als Online-Ausgabe ISBN 978-3-662-50447-5
    Language: English
    Subjects: Mathematics
    RVK:
    Keywords: Differentialgeometrie ; Diskretes Modell ; Dynamisches System ; Diskrete Geometrie ; Aufsatzsammlung ; Aufsatzsammlung ; Aufsatzsammlung
    Author information: Bobenko, Aleksandr I., 1960-
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  • 4
    Online Resource
    Online Resource
    Cham : Springer Nature | Berlin, Heidelberg :Springer Berlin Heidelberg :
    UID:
    almahu_9947381633302882
    Format: 1 online resource (X, 439 p. 114 illus., 67 illus. in color.)
    Edition: 1st ed. 2016.
    ISBN: 3-662-50447-2
    Content: This is one of the first books on a newly emerging field of discrete differential geometry and an excellent way to access this exciting area. It surveys the fascinating connections between discrete models in differential geometry and complex analysis, integrable systems and applications in computer graphics. The authors take a closer look at discrete models in differential geometry and dynamical systems. Their curves are polygonal, surfaces are made from triangles and quadrilaterals, and time is discrete. Nevertheless, the difference between the corresponding smooth curves, surfaces and classical dynamical systems with continuous time can hardly be seen. This is the paradigm of structure-preserving discretizations. Current advances in this field are stimulated to a large extent by its relevance for computer graphics and mathematical physics. This book is written by specialists working together on a common research project. It is about differential geometry and dynamical systems, smooth and discrete theories, and on pure mathematics and its practical applications. The interaction of these facets is demonstrated by concrete examples, including discrete conformal mappings, discrete complex analysis, discrete curvatures and special surfaces, discrete integrable systems, conformal texture mappings in computer graphics, and free-form architecture. This richly illustrated book will convince readers that this new branch of mathematics is both beautiful and useful. It will appeal to graduate students and researchers in differential geometry, complex analysis, mathematical physics, numerical methods, discrete geometry, as well as computer graphics and geometry processing.
    Note: Discrete conformal maps: Boundary value problems, circle domains, Fuchsian and Schottky uniformization: Alexander I. Bobenko, Stefan Sechelmann, Boris Springborn -- Discrete complex analysis on planar quad-graphs: Alexander I. Bobenko and Felix Günther -- Approximation of conformal mappings using conformally equivalent triangular lattices: Ulrike Bücking -- Numerical Methods for the Discrete Map Za: Folkmar Bornemann, Alexander Its, Sheehan Olver, and Georg Wechslberger -- A variational principle for cyclic polygons with prescribed edge lengths: Hana Kourimská, Lara Skuppin, Boris Springborn -- Complex Line Bundles over Simplicial Complexes and their Applications: Felix Knöppel and Ulrich Pinkall -- Holomorphic vector fields and quadratic differentials on planar triangular meshes: Wai Yeung Lam, Ulrich Pinkall -- Vertex normals and face curvatures of triangle meshes: Xiang Sun, Caigui Jiang, Johannes Wallner, and Helmut Pottmann -- S-conical cmc surfaces. Towards a unified theory of discrete surfaces with constant mean curvature: Alexander I. Bobenko and Tim Hoffmann -- Constructing solutions to the Björling problem for isothermic surfaces by structure preserving discretization: Ulrike Bücking and Daniel Matthes -- On the Lagrangian Structure of Integrable Hierarchies: Yuri B. Suris, Mats Vermeeren -- On the variational interpretation of the discrete KP equation: Raphael Boll, Matteo Petrera, and Yuri B. Suris -- Six topics on inscribable polytopes: Arnau Padrol and Günter M. Ziegler -- DGD Gallery: Storage, sharing, and publication of digital research data: Michael Joswig, Milan Mehner, Stefan Sechelmann, Jan Techter, and Alexander I. Bobenko. , English
    Additional Edition: ISBN 3-662-50446-4
    Language: English
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  • 5
    Book
    Book
    Oxford : Clarendon Press
    UID:
    b3kat_BV012877422
    Format: XXVII, 370 S. , Ill., graph. Darst.
    Edition: 1. publ.
    ISBN: 0198501609
    Series Statement: Oxford lecture series in mathematics and its applications 16
    Language: English
    Subjects: Mathematics
    RVK:
    RVK:
    Keywords: Diskretes System ; Integrables System ; Festkörperphysik ; Diskretes System ; Integrables System ; Differentialgeometrie ; Quantenphysik ; Diskretes System ; Integrables System ; Aufsatzsammlung ; Aufsatzsammlung ; Konferenzschrift
    Author information: Bobenko, Aleksandr I. 1960-
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  • 6
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    UID:
    almahu_9949301484102882
    Format: 1 online resource (441 pages)
    ISBN: 9783662504475
    Note: Intro -- Preface -- Contents -- Contributors -- Discrete Conformal Maps: Boundary Value Problems, Circle Domains, Fuchsian and Schottky Uniformization -- 1 Introduction -- 2 Discrete Conformal Equivalence of Cyclic Polyhedral Surfaces -- 2.1 Cyclic Polyhedral Surfaces -- 2.2 Notation -- 2.3 Discrete Metrics -- 2.4 Discrete Conformal Equivalence -- 2.5 Triangulations: Characterization by Length Cross-Ratios -- 2.6 Triangulations: Reconstructing Lengths from Length Cross-Ratios -- 2.7 Bipartite Graphs: Characterization by Length Multi-Ratios -- 2.8 Quadrangulations: The Cross-Ratio System on Quad-Graphs -- 3 Variational Principles for Discrete Conformal Maps -- 3.1 Discrete Conformal Mapping Problems -- 3.2 Analytic Formulation of the Mapping Problems -- 3.3 Variational Principles -- 3.4 The Triangle Functions -- 4 Conformal Maps of Cyclic Quadrangulations -- 4.1 Emerging Circle Patterns and a Necessary Condition -- 4.2 Riemann Maps with Cyclic Quadrilaterals -- 5 Multiply Connected Domains -- 5.1 Circle Domains -- 5.2 Special Slit Domains -- 6 Uniformization of Spheres -- 6.1 Uniformizing Quadrangulations of the Sphere -- 6.2 Using the Spherical Functional -- 6.3 Möbius Normalization -- 7 Uniformization of Tori -- 7.1 Immersed Tori -- 7.2 Elliptic Curves -- 7.3 Choosing Points on the Sphere -- 7.4 Numerical Experiments -- 7.5 Putting a Square Pattern on a Spherical Mesh -- 8 Uniformization of Surfaces of Higher Genus -- 8.1 Fundamental Polygons and Group Generators -- 8.2 From Schottky to Fuchsian Uniformization -- 8.3 Hyperelliptic Curves -- 8.4 Geometric Characterization of Hyperelliptic Surfaces -- 8.5 Example: Deforming a Hyperelliptic Surface -- 8.6 Example: Different Forms of the Same Genus-2 Surface -- References -- Discrete Complex Analysis on Planar Quad-Graphs -- 1 Introduction -- 2 Discrete Complex Analysis on Planar Quad-Graphs. , 2.1 Basic Definitions and Notation -- 2.2 Discrete Holomorphicity -- 2.3 Discrete Exterior Calculus -- 2.4 Discrete Laplacian -- 2.5 Discrete Green's Functions -- 2.6 Discrete Cauchy's Integral Formulae -- 3 Discrete Complex Analysis on Planar Parallelogram-Graphs -- 3.1 Preliminaries -- 3.2 Discrete Exponential Function -- 3.3 Asymptotics of the Discrete Green's Function -- 3.4 Asymptotics of Discrete Cauchy's Kernels -- 3.5 Integer Lattice -- References -- Approximation of Conformal Mappings Using Conformally Equivalent Triangular Lattices -- 1 Introduction -- 1.1 Convergence for Discrete Conformal PL-Maps on Triangular Lattices -- 1.2 Other Convergence Results for Discrete Conformal Maps -- 2 Some Characterizations of Associated Scale Factors of Discrete Conformal PL-Maps -- 3 Taylor Expansions -- 4 Existence of Discrete Conformal PL-Maps and Estimates -- References -- Numerical Methods for the Discrete Map Za -- 1 Introduction -- 2 Discrete Painlevé II Separatrix as a Boundary Value Problem -- 3 The Riemann--Hilbert Method -- 4 Lower Triangular Jump Matrices and Indices -- 5 RHPs as Integral Equations with Singular Kernels -- 6 A Well-Conditioned Spectral Method for Closed Contours -- 7 RHPs as Integral Equations with Nonsingular Kernels -- 8 A Modified Nyström Method -- 9 Conclusion -- References -- A Variational Principle for Cyclic Polygons with Prescribed Edge Lengths -- 1 Introduction -- 2 Euclidean Polygons. Proof of Theorem 1.1 -- 3 Spherical Polygons. Proof of Theorem 1.2 -- 4 Hyperbolic Polygons. Proof of Theorem 1.3 -- 5 Concluding Remarks on 1+1 Spacetime -- References -- Complex Line Bundles Over Simplicial Complexes and Their Applications -- 1 Introduction -- 2 Applications of Vector Bundles in Geometry Processing -- 2.1 Direction Fields on Surfaces -- 2.2 Stripe Patterns on Surfaces. , 2.3 Decomposing Velocity Fields into Fields Generated by Vortex Filaments -- 2.4 Close-To-Conformal Deformations of Volumes -- 3 Discrete Vector Bundles with Connection -- 4 Monodromy---A Discrete Analogue of Kobayashi's Theorem -- 5 Discrete Line Bundles---The Abelian Case -- 6 Discrete Connection Forms -- 7 Curvature---A Discrete Analogue of Weil's Theorem -- 8 The Index Formula for Hermitian Line Bundles -- 9 Piecewise-Smooth Vector Bundles over Simplicial Complexes -- 10 The Associated Piecewise-Smooth Hermitian Line Bundle -- 11 Finite Elements for Hermitian Line Bundles with Curvature -- 12 Discrete Energies on Surfaces---An Example -- References -- Holomorphic Vector Fields and Quadratic Differentials on Planar Triangular Meshes -- 1 Introduction -- 2 Discrete Conformality -- 2.1 Conformal Equivalence -- 2.2 Circle Patterns -- 3 Infinitesimal Deformations and Linear Conformal Theory -- 3.1 Infinitesimal Deformations of a Triangle -- 3.2 Harmonic Functions with Respect to the Cotangent Laplacian -- 4 Holomorphic Quadratic Differentials -- 5 Conformal Deformations in Terms of End(mathbbC2) -- 6 Weierstrass Representation of Discrete Minimal Surfaces -- References -- Vertex Normals and Face Curvatures of Triangle Meshes -- 1 Introduction -- 2 Smooth Line Congruences -- 3 Discrete Normal Congruences -- 4 Curvatures of Faces of Triangle Meshes -- 5 Results and Discussion -- References -- S-Conical CMC Surfaces. Towards a Unified Theory of Discrete Surfaces with Constant Mean Curvature -- 1 Introduction -- 2 Conical Nets -- 3 Curvatures of Conical Nets via Steiner's Formula -- 4 Dual Quadrilaterals and Koenigs Nets -- 5 Conical Nets with Constant Mean Curvature and S-Conical Nets -- 6 S-Isothermic Nets -- 7 S-Conical Nets as S-Isothermic Nets -- 8 S-Conical Nets with Constant Mean Curvature -- 9 Delaunay Nets -- References. , Constructing Solutions to the Björling Problem for Isothermic Surfaces by Structure Preserving Discretization -- 1 Introduction -- 2 Smooth Isothermic Surfaces -- 2.1 Coordinates and Domains -- 2.2 Definition and Equations -- 2.3 Local Solution of the Björling Problem -- 3 Discrete Isothermic Surfaces -- 3.1 Coordinates and Domains -- 3.2 Definition of Discrete Isothermic Surfaces -- 3.3 The Discrete Björling Problem -- 3.4 Discrete Quantities and Basic Relations -- 3.5 Discrete Gauss-Codazzi System -- 4 The Abstract Convergence Result -- 4.1 Domains -- 4.2 Statement of the Approximation Result -- 4.3 Consistency -- 4.4 Stability -- 5 The Continuous Limit of Discrete Isothermic Surfaces -- 5.1 From Björling Data to Cauchy Data and Back -- 5.2 Main Result -- 6 Transformations -- 6.1 Christoffel Transformation -- 6.2 Darboux Transformation -- References -- On the Lagrangian Structure of Integrable Hierarchies -- 1 Introduction -- 2 Pluri-Lagrangian Systems -- 2.1 Definition -- 2.2 Approximation by Stepped Surfaces -- 2.3 Multi-time Euler-Lagrange Equations for Curves -- 2.4 Multi-time Euler-Lagrange Equations for Two-Dimensional Surfaces -- 3 Pluri-Lagrangian Structure of the Sine-Gordon Equation -- 4 The KdV Hierarchy -- 5 Pluri-Lagrangian Structure of PKdV Hierarchy -- 5.1 Variational Symmetries and the Pluri-Lagrangian Form -- 5.2 The Multi-time Euler-Lagrange Equations -- 6 Relation to Hamiltonian Formalism -- 7 Conclusion -- References -- On the Variational Interpretation of the Discrete KP Equation -- 1 Introduction -- 2 The Root Lattice Q(AN) -- 3 The dKP Equation on Q(AN) -- 4 The Cubic Lattice mathbbZN -- 5 The dKP Equation on mathbbZN -- 6 Conclusion -- References -- Six Topics on Inscribable Polytopes -- 1 Inscribability of 3-Polytopes -- 2 A Characterization in Higher Dimensions -- 3 Neighborly Polytopes -- 4 Universally Inscribable. , 5 Universality -- 6 (i, j)-Scribability -- References -- DGD Gallery: Storage, Sharing, and Publication of Digital Research Data -- 1 Introduction -- 2 Comparison with Previous Work -- 3 Examples -- 3.1 Discrete S--Conical Catenoid and Helicoid -- 3.2 za Circle Pattern -- 3.3 Koebe Polyhedra -- 3.4 Lawson's Surface Uniformization -- 3.5 Tropical Grassmannian TropGr(2,6) -- 4 Architecture -- 4.1 What Is a Model? -- 4.2 Media Objects and Data Files -- 4.3 Versioning -- 4.4 Users -- 4.5 Submission Process -- 4.6 Publication and Licensing -- 5 Implementation -- 5.1 XML Based Backend and the XML Document Database BaseX -- 5.2 A Fail-Safe Release and Migration Process -- 5.3 A JavaScript Web Front End -- References.
    Additional Edition: Print version: Bobenko, Alexander I. Advances in Discrete Differential Geometry Berlin, Heidelberg : Springer Berlin / Heidelberg,c2016 ISBN 9783662504468
    Language: English
    Subjects: Mathematics
    RVK:
    Keywords: Electronic books. ; Electronic books.
    URL: OAPEN
    URL: OAPEN  (Creative Commons License)
    URL: Volltext  (kostenfrei)
    URL: Volltext  (lizenzpflichtig)
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  • 7
    Online Resource
    Online Resource
    Cham :Springer International Publishing, | Cham :Springer.
    UID:
    almafu_BV047580618
    Format: 1 Online-Ressource (X, 137 p. 57 illus., 53 illus. in color).
    Edition: 1st ed. 2021
    ISBN: 978-3-030-81847-0
    Series Statement: SpringerBriefs in Mathematics
    Additional Edition: Erscheint auch als Druck-Ausgabe ISBN 978-3-030-81846-3
    Additional Edition: Erscheint auch als Druck-Ausgabe ISBN 978-3-030-81848-7
    Language: English
    URL: Volltext  (URL des Erstveröffentlichers)
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  • 8
    Online Resource
    Online Resource
    Berlin ; Heidelberg : Springer Open
    UID:
    b3kat_BV043746271
    Format: 1 Online-Ressource (x, 439 Seiten) , Illustrationen, Diagramme
    ISBN: 9783662504475
    Additional Edition: Erscheint auch als Druck-Ausgabe ISBN 978-3-662-50446-8
    Language: English
    Subjects: Mathematics
    RVK:
    Keywords: Differentialgeometrie ; Diskretes Modell ; Dynamisches System ; Diskrete Geometrie ; Aufsatzsammlung
    URL: Volltext  (kostenfrei)
    Author information: Bobenko, Aleksandr I. 1960-
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  • 9
    Online Resource
    Online Resource
    Berlin ; Heidelberg : Springer
    UID:
    b3kat_BV037267425
    Format: 1 Online-Ressource (XII, 257 S.) , graph. Darst. , 24 cm
    ISBN: 9783642174124 , 9783642174131
    Series Statement: Lecture notes in mathematics 2013
    Note: Literaturangaben
    Additional Edition: Erscheint auch als Online-Ausgabe Computational Approach to Riemann Surfaces
    Language: English
    Subjects: Mathematics
    RVK:
    Keywords: Riemannsche Fläche ; Numerisches Verfahren
    URL: Volltext  (lizenzpflichtig)
    Author information: Bobenko, Aleksandr I. 1960-
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  • 10
    Book
    Book
    Berlin [u.a.] :Springer,
    UID:
    almahu_BV037267419
    Format: XII, 257 S. : , Ill., graph. Darst. ; , 24 cm.
    ISBN: 978-3-642-17412-4
    Series Statement: Lecture notes in mathematics 2013
    Note: Literaturangaben
    Additional Edition: Erscheint auch als Online-Ausgabe ISBN 978-3-642-17413-1
    Language: English
    Subjects: Mathematics
    RVK:
    Keywords: Riemannsche Fläche ; Numerisches Verfahren
    Author information: Bobenko, Aleksandr I., 1960-
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