Results 1 to 10 of about 506,738 (227)
Smooth quotients of bi-elliptic surfaces [PDF]
, 2016 We consider the quotient X of bi-elliptic surface by a finite automorphism group. If X is smooth, then it is a bi-elliptic surface or ruled surface with irregularity one.
Yoshihara, Hisao
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Hermitian spin surfaces with small eigenvalues of the Dolbeault operator [PDF]
, 2003 We study the compact Hermitian spin surfaces with positive conformal scalar curvature on which the first eigenvalue of the Dolbeault operator of the spin structure is the smallest possible. We prove that such a surface is either a ruled surface or a Hopf
Alexandrov, Bogdan
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On the Singularities of Surfaces Ruled by Conics [PDF]
, 2014 We classify the singularities of a surface ruled by conics: they are rational double points of type A n or D n . This is proved by showing that they arise from a precise series of blow-ups of a suitable surface geometrically ruled by conics. We determine
G. Sacchiero, M. Brundu
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Topological rigidity of algebraic $\P_3$-bundles over curves
, 2002 A projective algebraic surface which is homeomorphic to a ruled surface over a curve of genus $g\ge 1$ is itself a ruled surface over a curve of genus $g$.
Schmitt, Alexander
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Moduli spaces of vector bundles on a singular rational ruled surface
, 2015 We study moduli spaces $M_X(r,c_1,c_2)$ parametrizing slope semistable vector bundles of rank $r$ and fixed Chern classes $c_1, c_2$ on a ruled surface whose base is a rational nodal curve.
Bhosle, Usha N., Biswas, Indranil
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Lamarle Formula in 3-Dimensional Lorentz Space [PDF]
, 2010 The Lamarle Formula, given by Kruppa in \cite{Kr}, is known as a relationship between the Gaussian curvature and the distribution parameter of a ruled surface in the surface theory. The ruled surfaces were investigated in 3 different classes with respect
Ersoy, Soley, Tosun, Murat
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Instantons on cylindrical manifolds and stable bundles
, 2001 Let Sigma be a smooth complex curve, and let S be the product ruled surface Sigma \times CP^1. We prove a correspondence conjectured by Donaldson between finite energy U(2)-instantons over the cylinder Sigma \times S^1 \times R, and rank 2 holomorphic ...
Booß-Bavnbek +12 more
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Ruled special Lagrangian 3-folds in C^3 [PDF]
, 2000 This is the fourth in a series of papers math.DG/0008021, math.DG/0008155, math.DG/0010036 constructing explicit examples of special Lagrangian submanifolds (SL m-folds) in C^m.
Joyce, Dominic
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The Geometry of Statistical Models for Two-Way Contingency Tables with Fixed Odds Ratios [PDF]
, 2005 We study the geometric structure of the statistical models for two-by-two contingency tables. One or two odds ratios are fixed and the corresponding models are shown to be a portion of a ruled quadratic surface or a segment.
Carlini, Enrico, Rapallo, Fabio
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Smooth quasi-developable surfaces bounded by smooth curves
, 2019 Computing a quasi-developable strip surface bounded by design curves finds wide industrial applications. Existing methods compute discrete surfaces composed of developable lines connecting sampling points on input curves which are not adequate for ...
Bo, Pengbo +2 more
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