搜索结果: 136-150 共查到“知识库 代数几何学”相关记录335条 . 查询时间(3.074 秒)
A remark on Waring decompositions of some special plane quartics
remark Waring decompositions special plane quartics Algebraic Geometry
2012/4/16
This paper concerns Waring decompositions of a certain kind of plane quartics of high rank. The main result is the following. Let x, l_1, ...., l_7 be linear forms and q a quadratic form on a K-vector...
A stratification on the moduli spaces of symplectic and orthogonal bundles over a curve
stratification moduli spaces symplectic orthogonal bundles curve Algebraic Geometry
2012/4/23
A symplectic or orthogonal bundle $V$ of rank $2n$ over a curve has an invariant $t(V)$ which measures the maximal degree of its isotropic subbundles of rank $n$. This invariant $t$ defines stratifica...
Existence des diviseurs dicritiques, d'apres S.S.Abhyankar
Existence des diviseurs dicritiques d'apres S.S.Abhyankar Algebraic Geometry
2012/4/18
In geometric terms, given a singular foliation of the plane, a dicritical divisor is (whenever it exists) an irreducible component of the exceptional divisor which is transverse to the foliation. Abhy...
A cohomological classification of vector bundles on smooth affine threefolds
cohomological classification vector bundles smooth affine threefolds Algebraic Geometry
2012/4/23
We give a cohomological classification of vector bundles on smooth affine threefolds over algebraically closed fields having characteristic unequal to 2. As a consequence, if A is a smooth affine alge...
Stability conditions and extremal contractions
Stability conditions extremal contractions Algebraic Geometry
2012/4/18
We show that any extremal contraction from a smooth projective variety with dimension less than or equal to three appears as a moduli space of (semi)stable objects in the derived category of coherent ...
Constructing higher dimensional local fields
Constructing higher dimensional local fields Algebraic Geometry
2012/4/18
This note is a gentle introduction to higher dimensional local fields, with the motivating problem being the standard geometric "localisation-completion" process by which they can be constructed. A di...
A Derived Equivalence for some Twisted Projective Homogeneous Varieties
linear algebraic groups tilting sheaves homogeneous varieties Algebraic Geometry
2012/4/18
In this paper we construct a tilting sheaf for Severi-Brauer Varieties and Involution Varieties. This sheaf relates the derived category of each variety to the derived category of modules over a ring ...
Noncommutative desingularization of orbit closures for some representations of $GL_n$
determinantal variety symmetric minor pfaffian partial flag variety exceptional collection derived equivalence quiver with relations
2012/4/18
We describe noncommutative desingularizations of determinantal varieties, determinantal varieties defined by minors of generic symmetric matrices, and pfaffian varieties defined by pfaffians of generi...
Star configurations on generic hypersurfaces
star configurations point generic hypersurfaces Algebraic Geometry
2012/4/18
Let $F$ be a homogeneous polynomial in $S = \mathbb{C}[x_0,...,x_n]$. Our goal is to understand a particular polynomial decomposition of $F$; geometrically, we wish to determine when the hypersurface ...
Characteristic classes of Hilbert schemes of points via symmetric products
Hilbert scheme symmetric product generating series power structure Pontrjagin ring motivic exponentiation characteristic classes
2012/4/18
We obtain a formula for the generating series of (the push-forward under the Hilbert-Chow morphism of) the Hirzebruch homology characteristic classes of the Hilbert schemes of points for a smooth quas...
Quadro-quadric cremona transformations in low dimensions via the JC-correspondence
Quadro-quadric cremona transformations low dimensions JC-correspondence Algebraic Geometry
2012/4/18
We apply the results of arXiv:1109.3573 to study quadro-quadric Cremona transformations in low-dimensional projective spaces. In particular we describe new very simple families of such birational maps...
Unitary grassmannians
Algebraic groups hermitian and quadratic forms projective homogeneous varieties Chow groups and motives
2012/4/18
We study projective homogeneous varieties under an action of a projective unitary group (of outer type). We are especially interested in the case of (unitary) grassmannians of totally isotropic subspa...
On the classification of rational surface singularities
classification rational surface singularities Algebraic Geometry
2012/4/17
A general strategy is given for the classification of graphs of rational surface singularities. For each maximal rational double point configuration we investigate the possible multiplicities in the f...
Effective Non-vanishing of Asymptotic Adjoint Syzygies
Effective Non-vanishing Asymptotic Adjoint Syzygies Algebraic Geometry
2012/4/17
The purpose of this paper is to establish an effective non-vanishing theorem for the syzygies of an adjoint-type line bundle on a smooth variety, as the positivity of the embedding increases. Our purp...
Invariants of Topological Relative Right Equivalences
function germ integral closure Bruce-Roberts number
2012/4/17
The constancy of the Milnor number has several characterizations which were summarized by Greuel in 1986. This paper presents a study of these characterizations in the case of families of functions wi...