Download e-book for kindle: Conformal Geometry of Discrete Groups and Manifolds by B. N. Apanasov

By B. N. Apanasov

ISBN-10: 3110144042

ISBN-13: 9783110144048

This publication offers the 1st systematic account of conformal geometry of n-manifolds, in addition to its Riemannian opposite numbers. A unifying topic is their discrete holonomy teams. particularly, hyperbolic manifolds, in size three and better, are addressed. The therapy covers additionally proper topology, algebra (including combinatorial team idea and types of team representations), mathematics matters, and dynamics. development in those parts has been very speedy over the past twenty years, particularly because of the Thurston geometrization software, resulting in the answer of many tricky difficulties. a powerful attempt has been made to show new connections and views within the box and to demonstrate numerous elements of the idea. An intuitive technique which emphasizes the guidelines at the back of the buildings is complemented by way of quite a few examples and figures which either use and help the reader's geometric mind's eye. The textual content can be of worth to graduate scholars and researchers in topology, geometry, staff representations and theoretical physics.

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Extra resources for Conformal Geometry of Discrete Groups and Manifolds

Sample text

This is a straightforward generalization in the case of curves of the one given by Mumford in [42]. A. Barja and L. Stoppino Let C be a smooth curve, and let 'W C ! Pr 1 be a non-degenerate morphism. C; L / of dimension r such that ' is induced from the linear series jV j. e. jV j is a gdr 1 on C ). Linear stability gives a lower bound on the slope between the degree and the dimension of any projections, depending on the degree and dimension of the given linear series as follows. Definition 6. C; V /, is linearly semistable (resp.

RP 1/ for i D 1; : : : ; l (dlC1 D dl ) and that ri C1 i Observe that degG D li D1 ri . i i C1 / to get L2 2adegG a. 1 C ri C 1. l /; which finally proves 2adl d degG D 2 degG : a C dl r L2 Remark 23. The fact that we used Clifford’s theorem in the proof of the slope inequality via Xiao’s method in Example 3 can thus be rephrased in the following way: Clifford’s theorem implies the linear semistability of the general fibres of f together with their canonical systems. We can make the following improvement for the complete case.

Reine Angew. Math. 480, 177–195 (1996) 40. I. Morrison, Projective stability of ruled surfaces. Invent. Math. 56(3), 269–304 (1980) 41. I. Morrison, Stability of Hilbert Points of Generic K3 Surfaces, vol. 401 (Centre de Recerca Matemática, Bellaterra, 1999) 42. D. Mumford, Stability of projective varieties. L’Ens. Math. 23, 39–110 (1977) 43. D. Mumford, J. Fogarty, F. Kirwan, Geometric Invariant Theory. Ergebnisse der Mathematik und ihrer Grenzgebiete, vol. 34(2), 3rd edn. (Springer, Berlin, 1994) 44.

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Conformal Geometry of Discrete Groups and Manifolds by B. N. Apanasov

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