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1.
Let X be a smooth complex projective variety and let
be
a smooth submanifold of dimension
, which is the zero
locus of a section of an ample vector bundle
of rank
on X. Let H be an ample line bundle
on X, whose restriction
HZ to Z is generated by global sections.
Triplets
as above are classified under the
assumption that
is a polarized manifold of sectional genus
2. This can be regarded as a step towards the classification of ample
vector bundles of corank one and curve genus two.
Received: 6 June 2003 相似文献
2.
A. Lanteri 《Journal of Pure and Applied Algebra》2008,212(4):808-831
Let (X,L,V) be a triplet where X is an irreducible smooth complex projective variety, L is an ample and spanned line bundle on X and V⊆H0(X,L) spans L. The discriminant locus D(X,V)⊂|V| is the algebraic subset of singular elements of |V|. We study the components of D(X,V) in connection with the jumping sets of (X,V), generalizing the classical biduality theorem. We also deal with the degree of the discriminant (codegree of (X,L,V)) giving some bounds on it and classifying curves and surfaces of codegree 2 and 3. We exclude the possibility for the codegree to be 1. Significant examples are provided. 相似文献
3.
We consider a class of algebras whose Auslander-Reiten quivers have starting components that are not generalized standard.
For these components we introduce a generalization of a slice and show that only in finitely many cases (up to isomorphism)
a slice module is a tilting module.
The first named author was supported by the Polish Scientific Grant KBN No 1 P03A 018 27 相似文献
4.
5.
考虑一类量子Koszul代数的
${\mathbb{Z}}_{2}$-Galois覆盖$\Lambda_{\q}$, 并计算
这类代数的各阶Hochschild上同调群的维数,
进而利用道路的语言, 刻画了 Hochschild上同调环的cup积. 作为应用,
给出了这类代数的Hochschild上同调环模掉幂零理想的
代数结构. 相似文献
6.
Robin Hartshorne 《Mathematische Annalen》1978,238(3):229-280
7.
Viktoria Heu 《Mathematische Annalen》2009,344(2):463-490
We are interested in the stability of holomorphic rank 2 vector bundles of degree 0 over compact Riemann surfaces, which are
provided with irreducible meromophic tracefree connections. In the case of a logarithmic connection on the Riemann sphere,
such a vector bundle will be trivial up to the isomonodromic deformation associated to a small move of the poles, according
to a result of A. Bolibruch. In the general case of meromorphic connections over Riemann surfaces of arbitrary genus, we prove
that the vector bundle will be semi-stable, up to a small isomonodromic deformation. More precisely, the vector bundle underlying
the universal isomonodromic deformation is generically semi-stable along the deformation, and even maximally stable. For curves
of genus g ≥ 2, this result is non-trivial even in the case of non-singular connections.
The author was partially supported by ANR SYMPLEXE BLAN06-3-137237. 相似文献
8.
We know that in Ringel–Hall algebra of Dynkin type, the set of all skew commutator relations between the iso-classes of indecomposable modules forms a minimal Gr?bner–Shirshov basis,and the corresponding irreducible elements forms a PBW type basis of the Ringel–Hall algebra. We aim to generalize this result to the derived Hall algebra DH(A_n) of type A_n. First, we compute all skew commutator relations between the iso-classes of indecomposable objects in the bounded derived category D~b(A_n) using the Auslander–Reiten quiver of D~b(A_n), and then we prove that all possible compositions between these skew commutator relations are trivial. As an application, we give a PBW type basis of DH(A_n). 相似文献
9.
Let be an ample vector bundle of rank r ≥ 2 on a smooth complex projective variety X of dimension n such that there exists a global section of whose zero locus Z is a smooth subvariety of dimension n − r ≥ 3 of X. Let H be an ample line bundle on X such that its restriction H
Z
to Z is very ample. Triplets are classified under the assumption that (Z,H
Z
) has a smooth bielliptic curve section of genus ≥ 3 with .
相似文献
10.
11.
12.
13.
本文研究一类量子代数$\Lambda^n_q$的Hochschild上同调.量子代数$\Lambda^n_q$的极小投射双模分解被构造, $\Lambda^n_q$的各阶Hochschild上同调群的维数被清晰的给出.此外,对一些特殊的情况, $\Lambda^n_q$的上同调环也被清晰的刻画. 相似文献
14.
We investigate the existence of globally generated vector bundles of rank 2 with c1≤3 on a smooth quadric threefold and determine their Chern classes. As an automatic consequence, every rank 2 globally generated vector bundle on Q with c1=3 is an odd instanton up to twist. 相似文献
15.
Rosa M. Miro-Roig 《manuscripta mathematica》1993,79(1):391-402
Partially supported by DGICYT PB88-0224 相似文献
16.
Let X be a complex projective curve which is smooth and irreducibleof genus 2. The moduli space 2 of semistable symplectic vectorbundles of rank 4 over X is a variety of dimension 10. Afterassembling some results on vector bundles of rank 2 and odddegree over X, we construct a generically finite cover of 2by a family of 5-dimensional projective spaces, and outlinesome applications. 相似文献
17.
Atsushi Noma 《Proceedings of the American Mathematical Society》1998,126(1):35-43
The purpose of this paper is to classify ample and spanned vector bundles of top Chern number two on smooth projective varieties of arbitrary dimension defined over an algebraically closed field of characteristic zero.
18.
One describes, using a detailed analysis of Atiyah-Hirzebruch spectral sequence, the tuples of cohomology classes on a compact,
complex manifold, corresponding to the Chern classes of a complex vector bundle of stable rank. This classification becomes
more effective on generalized flag manifolds, where the Lie algebra formalism and concrete integrability conditions describe
in constructive terms the Chern classes of a vector bundle.
Since deceased. 相似文献
19.
Jianxing Yin 《组合设计杂志》2005,13(3):173-183
A Kirkman holey packing (resp. covering) design, denoted by KHPD(gu) (resp. KHCD(gu)), is a resolvable (gu, 3, 1) packing (resp. covering) design of pairs with u disjoint holes of size g, which has the maximum (resp. minimum) possible number of parallel classes. Each parallel class contains one block of size δ, while other blocks have size 3. Here δ is equal to 2, 3, and 4 when gu ≡ 2, 3, and 4 (mod 3) in turn. In this paper, the existence problem of a KHPD(2u) and a KHCD(2u) is solved with one possible exception of a KHPD(28). © 2004 Wiley Periodicals, Inc. 相似文献
20.
The structure of weak Hopf algebras corresponding to U q (sl 2) are classified by their algebra structure and coalgebra structure. The algebra structure of weak Hopf algebras corresponding to U q (sl 2) can be written as the direct sum of U q (sl 2) and an algebra of polynomials. The coalgebra structure of weak Hopf algebras corresponding to U q (sl 2) are classified by their Ext quiver. There are four types of such structures. 相似文献