Approach your problems from the right end It isn't that they can't see the solution. It is and begin with the answers. Then one day, that they can't see the problem. perhaps you will find the final question. G. K. Chesterton. The Scandal of Father 'The Hermit Clad in Crane Feathers' in R. Brown 'The point of a Pin'. van Gulik's The Chinese Maze Murders. Growing specialization and diversification have brought a host of monographs and textbooks on increasingly specialized topics. However, the "tree" of knowledge of mathematics and related fields does not grow only by putting forth new branches. It also happens, quite often in fact, that branches which were thought to be completely disparate are suddenly seen to be related. Further, the kind and level of sophistication of mathematics applied in various sciences has changed drastically in recent years: measure theory is used (non-trivially) in regional and theoretical economics; algebraic geometry interacts with physics; the Minkowsky lemma, coding theory and the structure of water meet one another in packing and covering theory; quantum fields, crystal defects and mathematical programming profit from homotopy theory; Lie algebras are relevant to filtering; and prediction and electrical engineering can use Stein spaces. And in addition to this there are such new emerging subdisciplines as "experimental mathematics", "CFD", "completely integrable systems", "chaos, synergetics and large-scale order", which are almost impossible to fit into the existing classification schemes. They draw upon widely different sections of mathematics.

Inhalt

1 Differential Geometry of Multicodimensional (n + 1)-Webs.- 1.1 Fibrations, Foliations, and d-Webs W(d, n, r) of Codimension r on a Differentiable Manifold Xnr.- 1.1.1 Definitions and Examples.- 1.1.2 Closed Form Equations of a Web W(n + 1, n, r) and Further Examples.- 1.2 The Structure Equations and Fundamental Tensors of a Web W(n + 1, n, r).- 1.2.1 Moving Frames Associated with a Web W(n + 1, n, r).- 1.2.2 The Structure Equations and Fundamental Tensors of a Web W(n + 1, n, r).- 1.2.3 The Structure Equations and Fundamental Tensors of a Web W(3, 2, r).- 1.2.4 Special Classes of 3-Webs W(3, 2, r).- 1.3 Invariant Affine Connections Associated with a Web W(n + 1, n, r).- 1.3.1 The Geometrical Meaning of the Forms Wji(?).- 1.3.2 Affine Connections Associated with an (n + 1)-Web.- 1.3.3 The Affine Connections Induced by the Connnection ?n+ 1 on Leaves.- 1.3.4 Affine Connections Associated with 3-Subwebs of an (n + 1)-Web.- 1.4 Webs W(n + 1, n, r) with Vanishing Curvature.- 1.5 Parallelisable (n + 1)-Webs.- 1.6 (n + 1)-Webs with Paratactical 3-Subwebs.- 1.7 (n + 1)-Webs with Integrable Diagonal Distributions of 4-Subwebs.- 1.8 (n + 1)-Webs with Integrable Diagonal Distributions.- 1.9 Transversally Geodesic (n + 1)-Webs.- 1.10 Hexagonal (n + 1)-Webs.- 1.11 Isoclinic (n + 1)-Webs.- Notes.- 2 Almost Grassmann Structures Associated with Webs W(n + 1, n, r).- 2.1 Almost Grassmann Structures on a Differentiable Manifold.- 2.1.1 The Segre Variety and the Segre Cone.- 2.1.2 Grassmann and Almost Grassmann Structures.- 2.2 Structure Equations and Torsion Tensor of an Almost Grassmann Manifold.- 2.3 An Almost Grassmann Structure Associated with a Web W(n + 1, n, r).- 2.4 Semiintegrable Almost Grassmann Structures and Transversally Geodesic and Isoclinic (n + 1)-Webs.- 2.5 Double Webs.- 2.6 Problems of Grassmannisation and Algebraisation and Their Solution for Webs W(d, n, r), d ? n + 1.- 2.6.1 The Grassmannisation Problem for a Web W(n + l, n, r).- 2.6.2 The Grassmannisation Problem for a Web W(d, n, r), d> n + 1.- 2.6.3 The Algebraisation Problem for a Web W(3, 2, r).- 2.6.4 The Algebraisation Problem for a Web W(n + 1, n, r).- 2.6.5 The Algebraisation Problem for Webs W(d, n, r), d> n + 1.- Notes.- 3 Local Differentiable n-Quasigroups Associated with a Web W(n + 1, n, r).- 3.1 Local Differentiable n-Quasigroups of a Web W(n + 1, n, r).- 3.2 Structure of a Web W(n + 1, n, r) and Its Coordinate n-Quasigroups in a Neighbourhood of a Point.- 3.3 Computation of the Components of the Torsion and Curvature Tensors of a Web W(n + 1, n, r) in Terms of Its Closed Form Equations.- 3.4 The Relations between the Torsion Tensors and Alternators of Parastrophic Coordinate n-Quasigroups.- 3.5 Canonical Expansions of the Equations of a Local Analytic n-Quasigroup.- 3.6 The One-Parameter n-Subquasigroups of a Local Differentiable n-Quasigroup.- 3.7 Comtrans Algebras.- 3.7.1 Preliminaries.- 3.7.2 Comtrans Structures.- 3.7.3 Masking.- 3.7.4 Lie's Third Fundamental Theorem for Analytic 3-Loops.- 3.7.5 General Case of Analytic n-Loops.- Notes.- 4 Special Classes of Multicodimensional (n + 1)-Webs.- 4.1 Reducible (n + 1)-Webs.- 4.2 Multiple Reducible and Completely Reducible (n + 1)-Webs.- 4.3 Group (n + 1)-Webs.- 4.4 (2n + 2)-Hedral (n + 1)-Webs.- 4.5 Bol (n + 1)-Webs.- 4.5.1 Definition and Properties of Bol and Moufang (n + 1)-Webs.- 4.5.2 The Bol Closure Conditions.- 4.5.3 A Geometric Characteristic of Bol (n + 1)-Webs.- 4.5.4 An Analytic Characteristic of the Bol Closure Condition (Bn + 1n + 1).- Notes.- 5 Realisations of Multicodimensional (n + 1)-Webs.- 5.1 Grassmann (n + 1)-Webs.- 5.1.1 Basic Definitions.- 5.1.2 The Structure Equations of Projective Space.- 5.1.3 Specialisation of Moving Frames.- 5.1.4 The Structure Equations and the Fundamental Tensors of a Grassmann (n + 1)-Web.- 5.1.5 Transversally Geodesic and Isoclinic Surfaces of a Grassmann (n + 1)-Web.- 5.1.6 The Hexagonality Tensor of a Grassmann (n + 1)-Web and the 2nd Fundamental Forms of Surfaces U?.- 5.2 The Grassmannisation Theorem for Multicodimensional (n + 1)-Webs.- 5.3 Reducible Grassmann (n + 1)-Webs.- 5.4 Algebraic, Bol Algebraic, and Reducible Algebraic (n + 1)-Webs.- 5.4.1 General Algebraic (n + 1)-Webs.- 5.4.2 Bol Algebraic (n + 1)-Webs.- 5.4.3 Reducible Algebraic (n + 1)-Webs.- 5.4.4 Multiple Reducible Algebraic (n + 1)-Webs.- 5.4.5 Reducible Algebraic Four-Webs.- 5.4.6 Completely Reducible Algebraic (n + 1)-Webs.- 5.5 Moufang Algebraic (n + 1)-Webs.- 5.6 (2n + 2)-Hedral Grassmann (n + 1)-Webs.- 5.7 The Fundamental Equations of a Diagonal 4-Web Formed by Four Pencils of (2r)-Planes in P3r.- 5.8 The Geometry of Diagonal 4-Webs in P3r.- Notes.- 6 Applications of the Theory of (n + 1)-Webs.- 6.1 The Application of the Theory of (n + 1)-Webs to the Theory of Point Correspondences of n + 1 Projective Lines.- 6.1.1 The Fundamental Equations.- 6.1.2 Correspondences among n + 1 Projective Lines and One-Codimensional (n + 1)-Webs.- 6.1.3 Parallelisable Correpondences.- 6.1.4 Hexagonal Correspondences.- 6.1.5 The Godeaux Homography.- 6.1.6 Parallelisable Godeaux Homographies.- 6.2 The Application of the Theory of (n + 1)-Webs to the Theory of Point Correspondences of n + 1 Projective Spaces.- 6.2.1 The Fundamental Equations.- 6.2.2 Correspondences among n + 1 Projective Lines and Multicodimensional (n + 1)-Webs.- 6.2.3 Parallelisable Correpondences.- 6.2.4 Godeaux Homographies.- 6.2.5 Parallelisable Godeaux Homographies.- 6.2.6 Paratactical Correspondences.- 6.3 Application of the Theory of (n + 1)-Webs to the Theory of Holomorphic Mappings between Polyhedral Domains.- 6.3.1 Introductory Note.- 6.3.2 Analytical Polyhedral Domains in Cn, n> 1.- 6.3.3 Meromorphic Webs in Domains of Cn, n> 1.- 6.3.4 Partition Webs Generated by Analytical Polyhedral Domains.- 6.3.5 Partition Webs with Parallelisable Foliations.- 6.3.6 Partition Webs with Invariant Functions.- Notes.- 7 The Theory of Four-Webs W(4, 2, r).- 7.1 Differential geometry of Four-Webs W(4, 2, r).- 7.1.1 Basic Notions and Equations.- 7.1.2 The Geometrical Meaning of the Basis Affinor.- 7.1.3 Transversal Bivectors Associated with a 4-Web.- 7.1.4 Permutability of Transformations [?, ?].- 7.1.5 Fundamental Equations of a Web W(4, 2, r).- 7.1.6 The Affine Connections Associated with a Web W(4, 2, r).- 7.1.7 Conditions of Geodesicity of Some Lines on the Leaves of a 4…