全文获取类型
收费全文 | 2122篇 |
免费 | 40篇 |
国内免费 | 208篇 |
专业分类
化学 | 10篇 |
力学 | 1篇 |
综合类 | 22篇 |
数学 | 2032篇 |
物理学 | 305篇 |
出版年
2024年 | 8篇 |
2023年 | 22篇 |
2022年 | 26篇 |
2021年 | 32篇 |
2020年 | 48篇 |
2019年 | 73篇 |
2018年 | 80篇 |
2017年 | 81篇 |
2016年 | 32篇 |
2015年 | 28篇 |
2014年 | 44篇 |
2013年 | 484篇 |
2012年 | 29篇 |
2011年 | 74篇 |
2010年 | 79篇 |
2009年 | 95篇 |
2008年 | 138篇 |
2007年 | 125篇 |
2006年 | 96篇 |
2005年 | 99篇 |
2004年 | 97篇 |
2003年 | 79篇 |
2002年 | 83篇 |
2001年 | 63篇 |
2000年 | 68篇 |
1999年 | 68篇 |
1998年 | 78篇 |
1997年 | 52篇 |
1996年 | 14篇 |
1995年 | 14篇 |
1994年 | 12篇 |
1993年 | 7篇 |
1992年 | 9篇 |
1991年 | 6篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1959年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有2370条查询结果,搜索用时 0 毫秒
61.
Valiollah Khalili 《代数通讯》2013,41(10):3646-3661
Locally extended affine Lie algebras are a general version of extended affine Lie algebras. In this article, we completely describe the structure of the core of a locally extended affine Lie algebra. We prove that the core of a locally extended affine Lie algebra is a direct limit of Lie tori. 相似文献
62.
63.
Raúl Felipe-Sosa Raúl Felipe Juana Sánchez-Ortega Michael K. Kinyon 《Linear and Multilinear Algebra》2013,61(6):811-830
We adapt the algorithm of Kolesnikov and Pozhidaev, which converts a polynomial identity for algebras into the corresponding identities for dialgebras, to the Cayley–Dickson doubling process. We obtain a generalization of this process to the setting of dialgebras, establish some of its basic properties, and construct dialgebra analogues of the quaternions and octonions. 相似文献
64.
Let Γ and Λ be artin algebras such that Γ is a split-by-nilpotent extension of Λ by a two sided ideal I of Γ. Consider the change of rings functors G: =ΓΓΛ ?Λ ? and F: =ΛΛΓ ?Γ ?. In this article, by assuming that I Λ is projective, we find the necessary and sufficient conditions under which a stratifying system (Θ, ≤) in modΛ can be lifted to a stratifying system (GΘ, ≤) in mod(Γ). Furthermore, by using the functors F and G, we study the relationship between their filtered categories of modules; and some connections with their corresponding standardly stratified algebras are stated (see Theorem 5.12, Theorem 5.15 and Theorem 5.18). Finally, a sufficient condition is given for stratifying systems in mod(Γ) in such a way that they can be restricted, through the functor F, to stratifying systems in mod(Λ). 相似文献
65.
66.
67.
ON THE COHOMOLOGY OF GENERALIZED RESTRICTED LIE ALGEBRAS 总被引:2,自引:0,他引:2
Shu Bin 《数学年刊B辑(英文版)》1998,19(4):421-432
0.IntroductionThispaperisaimedatdevelopingthecohomologytheoryofmodularLiealgebrasandthendeterminingthefirstcohomologygroupsofCartantypeLiealgebras.AsgeneralizationoftheconceptofrestrictedLiealgebras,ageneralizedrestrictedLiealgebra(GRLiealgebra)wasintroducedin[21],whichisassociatedwithabasisandamappingofthebasisintotheLiealgebrasatisfyingthegeneralized-restrictednessconditions.Generalizedrestrictedrepresentations(GRrepresentations)werethenintroduced,whichcanbereducedtotherepresentationsofa… 相似文献
68.
This paper mainly concerns a tuple of multiplication operators
defined on the weighted and unweighted multi-variable Bergman
spaces, their joint reducing subspaces and the von Neumann algebra
generated by the orthogonal projections onto these subspaces. It is
found that the weights play an important role in the structures of
lattices of joint reducing subspaces and of associated von Neumann
algebras. Also, a class of special weights is taken into account.
Under a mild condition it is proved that if those multiplication
operators are defined by the same symbols, then the corresponding
von Neumann algebras are $*$-isomorphic to the one defined on the
unweighted Bergman space. 相似文献
69.
70.