搜索结果: 1-15 共查到“知识库 射影几何学”相关记录44条 . 查询时间(2.172 秒)
基于最优线性码与射影几何理论，针对不同码长最优码的距离特性，研究了低维五元最优LCD码的构造。首先利用删截等方法构造了较小码长的三维和四维最优线性码以及最优LCD码；其次，借助部分已知矩阵和删截等方法构造了较大码长的三维和四维最优线性码以及最优LCD码；最后，利用已知最优LCD码和特殊码长最优自正交码构造了任意大码长的最优LCD码，完全解决了三维和四维最优LCD码的构造问题。这些LCD码的构造方法...
CONVEX REAL PROJECTIVE STRUCTURES ON CLOSED SURFACES ARE CLOSED
REAL PROJECTIVE STRUCTURES CLOSED SURFACES
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2015/9/29
T. The deformation space t(E) of convex Rp2_ structures on a closed
surface Y with X(z) < 0 is closed in the space Hom(7r, SL(3, IR))/SL(3, IR)
of equivalence classes of representations r1 (l) -- ...
Characterizations of projective spaces and hyperquadrics
Characterizations of projective spaces hyperquadrics
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2011/2/25
Projective spaces and hyperquadrics are the simplest projective algebraic varieties, and they can be characterized in many ways. The aim of this paper is to provide a new characterization of them in t...
Unification and projectivity in Fregean varieties
unification projectivity Fregean varieties
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2011/1/18
In some varieties of algebras one can reduce the question of finding most general unifiers (mgus) to the problem of the existence of unifiers that fulfill the additional condition called projectivity....
Conjugate Projective Limits
Conjugate Projective Limits
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2011/1/17
We characterize conjugate nonparametric Bayesian models as projective limits of conjugate, nite-dimensional Bayesian models. In particular, we identify a large class of nonparametric models represent...
The varieties of tangent lines to hypersurfaces in projective spaces
varieties of tangent lines hypersurfaces projective spaces
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2011/1/20
or a hypersurface in a projective space, we consider the set of pairs of a point and a line in the projective space such that the line intersects the hypersurface at the point with a fixed multiplicit...
The translation operator for self-projective coalgebras
translation operator self-projective coalgebras
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2011/1/17
We describe the transpose operator for self-projective and symmetric coalgebras in terms of the syzygy and Nakayama functors.
Limites projectives fortes d'algébroïdes de Lie
Limites projectives fortes d'algébroï des de Lie
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2011/1/18
We define the notion of strong projective limit of Banach Lie algebroids. We study the associated structures of Fr´echet bundles and the compatibility with the different morphisms. We then use t...
Characterizations of Projective Spaces and Hyperquadrics via Positivity Properties of the Tangent Bundle
Characterizations of Projective Spaces Hyperquadrics Positivity Properties Tangent Bundle
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2011/1/20
Let X be a smooth complex projective variety. A re-cent conjecture of S. Kov´acs states that if the pth-exterior power of the tangent bundle TX contains the pth-exterior power of an am-
ple vec...
Grafting Real Complex Projective Structures with Fuchsian Holonomy
Grafting Real Complex Projective Structures Fuchsian Holonomy
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2011/1/20
Let G(S, ρ) be a graph whose vertices are complex projective struc-tures with holonomy ρ and whose edges are graftings from one vertex to another. If ρ is quasi-Fuchsian, a theorem of Goldman implies ...
Some comments on projective quadrics subordinate to pseudo--Hermitian spaces
Some comments projective quadrics subordinate pseudo--Hermitian spaces
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2011/1/17
We study in some detail the structure of the projective quadric Q′obtained by taking the quotient of the isotropic cone in a standard pseudohermitian space Hp,q with respect to the positive real numbe...
Scalar curvature and asymptotic Chow stability of projective bundles and blowups
Scalar curvature asymptotic Chow stability projective bundles blowups
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2010/12/14
The holomorphic invariants introduced by Futaki as obstruction to the asymptotic Chow semistability are studied by an algebraic-geometric point of view and are shown to be the
Mumford weights of suit...
Threefolds with quasi-projective universal cover
universal cover L2-theory geometric orbifolds MMP
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2010/12/9
We study compact Kähler threefolds X with infinite fundamental group whose universal cover can be compactified. Combining techniques from L2-theory, Campana’s geometric orbifolds and the minimal ...
Good reduction of the Brauer-Manin obstruction
Good reduction Brauer-Manin obstruction
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2010/11/26
For a smooth and projective variety over a number field with torsion free geometric Picard group and finite transcendental Brauer group we show that only the archimedean places, the primes of bad redu...
Weighted Bergman Projections and Kernels: Lp Regularity and Zeros
Weighted Bergman Projections Kernels: Lp Regularity Zeros
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2010/12/6
We investigate Lp regularity of weighted Bergman projec-tions and zeros of weighted Bergman kernels for the weights that are radially symmetric and comparable to 1 on the unit disc.