Results 291 to 300 of about 7,475,610 (328)

INVARIANTS OF THE SMOOTH STRUCTURE OF AN ALGEBRAIC SURFACE ARISING FROM THE DIRAC OPERATOR

, 1993
We construct invariants of the smooth structure of an algebraic surface in terms of coupled Dirac operators. The invariants allow us to distinguish between del Pezzo surfaces and fake del Pezzo surfaces by their smooth structure.
V. Pidstrigach, A. Tyurin
semanticscholar   +1 more source

The variety of complete pairs of zero-dimensional subschemes of an algebraic surface

, 1997
We investigate the variety of zero-dimensional subschemes (that is, systems of points) and of given lengths and on a smooth projective algebraic surface .
A. Tikhomirov
semanticscholar   +1 more source

Algebraic degree of a general group-velocity surface

, 2017
Three algebraic surfaces — the slowness surface, the phase-velocity surface, and the group-velocity surface — play fundamental roles in the theory of seismic wave propagation in anisotropic elastic media.
V. Grechka
semanticscholar   +1 more source

DEFORMING TORSION-FREE SHEAVES ON AN ALGEBRAIC SURFACE

, 1991
This paper investigates the question of removability of singularities of torsion-free sheaves on algebraic surfaces in the universal deformation and the existence in it of a nonempty open set of locally free sheaves, and describes the tangent cone to the
I. V. Artamkin
semanticscholar   +1 more source

Invariant groups associated with an algebraic surface

Mathematical Proceedings of the Cambridge Philosophical Society, 1940
Alexander (1, 2) has introduced certain topological invariants of a manifold which arise from the intersections of cycles of non-complementary dimensions, and he points out that they are not derivable from the Betti and torsion numbers, nor from the ...
D. B. Scott
semanticscholar   +1 more source

The equivariant cohomology groups of a real algebraic surface and their applications

, 1996
Exact sequences connecting the equivariant cohomology groups of a real algebraic surface are constructed, and sufficient conditions for the convergence of the second spectral sequence are established.
V. A. Krasnov
semanticscholar   +1 more source

Investigation of a real algebraic surface

Programming and computer software, 2015
A. Batkhin, A. Bruno
semanticscholar   +1 more source

Algebraic Surface

Computer Vision, A Reference Guide, 2014
Boran Zheng
semanticscholar   +1 more source

Dynamics of a 3D autonomous quadratic system with an invariant algebraic surface

, 2014
Zhen Wang, Zhouchao Wei, Xiaojian Xi, Yongxin Li   +3 more
semanticscholar   +1 more source

The topology of normal singularities of an algebraic surface and a criterion for simplicity

, 1961
D. Mumford
semanticscholar   +1 more source