全文获取类型
收费全文 | 708篇 |
免费 | 41篇 |
国内免费 | 88篇 |
专业分类
化学 | 10篇 |
力学 | 1篇 |
综合类 | 20篇 |
数学 | 783篇 |
物理学 | 23篇 |
出版年
2024年 | 3篇 |
2023年 | 16篇 |
2022年 | 23篇 |
2021年 | 18篇 |
2020年 | 19篇 |
2019年 | 31篇 |
2018年 | 23篇 |
2017年 | 21篇 |
2016年 | 13篇 |
2015年 | 12篇 |
2014年 | 25篇 |
2013年 | 112篇 |
2012年 | 22篇 |
2011年 | 20篇 |
2010年 | 31篇 |
2009年 | 38篇 |
2008年 | 36篇 |
2007年 | 34篇 |
2006年 | 37篇 |
2005年 | 40篇 |
2004年 | 18篇 |
2003年 | 34篇 |
2002年 | 28篇 |
2001年 | 34篇 |
2000年 | 36篇 |
1999年 | 21篇 |
1998年 | 34篇 |
1997年 | 21篇 |
1996年 | 11篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1959年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有837条查询结果,搜索用时 562 毫秒
101.
Changjian Fu 《代数通讯》2013,41(7):2410-2418
We show that a tilting module over the endomorphism algebra of a cluster-tilting object in a 2-Calabi–Yau triangulated category lifts to a cluster-tilting object in this 2-Calabi–Yau triangulated category. This generalizes a recent work of Smith for cluster categories. 相似文献
102.
Shuanhong Wang 《代数通讯》2013,41(3):1019-1049
103.
Adriana Balan 《代数通讯》2013,41(4):1491-1525
In this article, we consider categories of all semimodules over semirings which are p-Schreier varieties, i.e., varieties whose projective algebras are all free. Among other results, we show that over a division semiring R all semimodules are projective iff R is a division ring, prove that categories of all semimodules over proper additively π-regular semirings are not p-Schreier varieties (in particular, this result solves Problem 1 of Katsov [8]), as well as prove that categories of all semimodules over cancellative division semirings are, in contrast, p-Schreier varieties. 相似文献
104.
105.
Let H be a hereditary algebra of Dynkin type D n over a field k and 𝒞 H be the cluster category of H. Assume that n ≥ 5 and that T and T′ are tilting objects in 𝒞 H . We prove that the cluster-tilted algebra Γ = End𝒞 H (T)op is isomorphic to Γ′ = End𝒞 H (T′)op if and only if T = τ i T′ or T = στ j T′ for some integers i and j, where τ is the Auslander–Reiten translation and σ is the automorphism of 𝒞 H defined in Section 4. 相似文献
106.
Atabey Kaygun 《代数通讯》2013,41(7):2513-2537
For module algebras and module coalgebras over an arbitrary bialgebra, we define two types of bivariant cyclic cohomology groups called bivariant Hopf cyclic cohomology and bivariant equivariant cyclic cohomology. These groups are defined through an extension of Connes' cyclic category Λ. We show that, in the case of module coalgebras, bivariant Hopf cyclic cohomology specializes to Hopf cyclic cohomology of Connes and Moscovici and its dual version by fixing either one of the variables as the ground field. We also prove an appropriate version of Morita invariance for both of these theories. 相似文献
107.
David Pauksztello 《代数通讯》2013,41(2):386-394
The idea of a co-t-structure is almost ‘dual’ to that of a t-structure, but with some important differences. This note establishes co-t-structure analogues of Beligiannis and Reiten's corresponding results on compactly generated t-structures. 相似文献
108.
109.
Yu-Han Liu 《代数通讯》2013,41(8):3013-3031
We compute Balmer's prime spectrum for the derived category of quiver representations for a finite ordered quiver with the vertex-wise tensor product and show that it does not recover the quiver. We then associate an algebra to every k-linear triangulated tensor category and show that the path algebra can be recovered in this way. 相似文献
110.
Robert Lubarsky 《代数通讯》2013,41(4):1644-1649
Walker's cancellation theorem says that, if B ⊕ Z is isomorphic to C ⊕ Z in the category of abelian groups, then B is isomorphic to C. We construct an example in a diagram category of abelian groups where the theorem fails. As a consequence, the original theorem does not have a constructive proof even if B and C are subgroups of the free abelian group on two generators. Both of these results contrast with a group whose endomorphism ring has stable range one, which allows a constructive proof of cancellation and also a proof in any diagram category. 相似文献