全文获取类型
收费全文 | 380篇 |
免费 | 11篇 |
国内免费 | 46篇 |
专业分类
化学 | 14篇 |
综合类 | 1篇 |
数学 | 394篇 |
物理学 | 28篇 |
出版年
2023年 | 10篇 |
2022年 | 13篇 |
2021年 | 10篇 |
2020年 | 12篇 |
2019年 | 9篇 |
2018年 | 14篇 |
2017年 | 10篇 |
2016年 | 4篇 |
2015年 | 9篇 |
2014年 | 8篇 |
2013年 | 45篇 |
2012年 | 5篇 |
2011年 | 16篇 |
2010年 | 10篇 |
2009年 | 22篇 |
2008年 | 23篇 |
2007年 | 19篇 |
2006年 | 21篇 |
2005年 | 15篇 |
2004年 | 24篇 |
2003年 | 26篇 |
2002年 | 25篇 |
2001年 | 23篇 |
2000年 | 16篇 |
1999年 | 14篇 |
1998年 | 13篇 |
1997年 | 11篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有437条查询结果,搜索用时 15 毫秒
191.
192.
193.
194.
A semigroup is complex if it generates a variety the subvariety lattice of which contains an isomorphic copy of every finite
lattice. It is known that a complex semigroup has at least four elements and that up to isomorphism and anti-isomorphism,
there are four complex semigroups of order four. Subvarieties of the varieties generated by two of these four minimal complex
semigroups have previously been described. To complete the study, we describe subvarieties of the varieties generated by the
remaining two semigroups.
This research was partially supported by the National Natural Science Foundation of China (No.10571077) and the Natural Science
Foundation of Gansu Province (No.3ZS052-A25-017) 相似文献
195.
Inspired by recent work of Cerulli, Feigin and Reineke on desingularizations of quiver Grassmannians of representations of Dynkin quivers, we obtain desingularizations in considerably more general situations and in particular for Grassmannians of modules over iterated tilted algebras of Dynkin type. Our desingularization map is constructed from Nakajima's desingularization map for graded quiver varieties. 相似文献
196.
Nikolay Qviller 《Mathematische Nachrichten》2014,287(11-12):1394-1420
We provide a structural generalization of a theorem by Kleiman–Piene, concerning the enumerative geometry of nodal curves in a complete linear system on a smooth projective surface S. Provided that r, the number of nodes, is sufficiently small compared to the ampleness of the linear system, we show that, under certain assumptions, the number of r‐nodal curves passing through points in general position on S is given by a Bell polynomial in universally defined integers which we identify, using classical intersection theory, as linear, integral polynomials evaluated in four basic Chern numbers. Furthermore, we provide a decomposition of the as a sum of three terms with distinct geometric interpretations, and discuss the relationship between these polynomials and Kazarian's Thom polynomials for multisingularities of maps. 相似文献
197.
Stephan Neupert 《Mathematische Nachrichten》2014,287(4):405-431
For connected reductive groups G over a finite extension F of and L the maximal unramified extension of F we study the sets of elements with given Hodge points . We explain the relationship to stratifications of some moduli scheme of abelian varieties defined by Goren and Oort respectively Andreatta and Goren. We show that for sufficiently large N the Newton point is constant on the sets and compute such N for certain classes of groups. 相似文献
198.
Integral models in unramified mixed characteristic (0, 2) of hermitian orthogonal Shimura varieties of PEL type,Part II 下载免费PDF全文
Adrian Vasiu 《Mathematische Nachrichten》2014,287(14-15):1756-1773
We construct relative PEL type embeddings in mixed characteristic (0, 2) between hermitian orthogonal Shimura varieties of PEL type. We use this to prove the existence of integral canonical models in unramified mixed characteristic (0, 2) of hermitian orthogonal Shimura varieties of PEL type. 相似文献
199.
Algebraic variety is the most important subject in classical algebraic geometry. As the zero set of multivariate splines, the piecewise algebraic variety is a kind generalization of the classical algebraic variety. This paper studies the correspondence between spline ideals and piecewise algebraic varieties based on the knowledge of algebraic geometry and multivariate splines. 相似文献
200.
KARPENKO Nikita A. 《中国科学 数学(英文版)》2012,55(5):937-945
We prove the so-called Unitary Hyperbolicity Theorem,a result on hyperbolicity of unitary involutions.The analogous previously known results for the orthogonal and symplectic involutions are formal consequences of the unitary one.While the original proofs in the orthogonal and symplectic cases were based on the incompressibility of generalized Severi-Brauer varieties,the proof in the unitary case is based on the incompressibility of their Weil transfers. 相似文献