全文获取类型
收费全文 | 956篇 |
免费 | 67篇 |
国内免费 | 126篇 |
专业分类
化学 | 6篇 |
力学 | 2篇 |
综合类 | 11篇 |
数学 | 1077篇 |
物理学 | 53篇 |
出版年
2024年 | 4篇 |
2023年 | 24篇 |
2022年 | 28篇 |
2021年 | 17篇 |
2020年 | 50篇 |
2019年 | 33篇 |
2018年 | 42篇 |
2017年 | 25篇 |
2016年 | 15篇 |
2015年 | 27篇 |
2014年 | 25篇 |
2013年 | 109篇 |
2012年 | 27篇 |
2011年 | 50篇 |
2010年 | 41篇 |
2009年 | 60篇 |
2008年 | 86篇 |
2007年 | 53篇 |
2006年 | 55篇 |
2005年 | 49篇 |
2004年 | 29篇 |
2003年 | 45篇 |
2002年 | 46篇 |
2001年 | 37篇 |
2000年 | 23篇 |
1999年 | 42篇 |
1998年 | 37篇 |
1997年 | 21篇 |
1996年 | 13篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有1149条查询结果,搜索用时 31 毫秒
71.
令K是一个内部(记作intK)包含原点o的凸体,bdK为其边界,m为覆盖K所需的intK的平移的最小个数.本文证明,存在正实数η和含于η(bdK)的m元点集C1使得C1+int K覆盖K;存在正实数η′、实数γ∈(0,1)和含于η′(bd K)的m元点集C2使得C2+γK覆盖K.基于这两个事实,本文得到关于凸体覆盖的Hadwiger猜想的两个等价形式.本文还引入一个可以替代宗传明提出的攻克Hadwiger猜想的数量方案中的γm(K)的新泛函. 相似文献
72.
In this paper, we prove that if in a Riemannian manifold, the minimum covering radius of a point triple of small diameter depends only on the geodesic distances between the points, then the manifold must be of constant curvature. This implies that if in a complete connected Riemannian manifold, the volume of the intersection of three small geodesic balls of equal radii depends only on the distances between the centers and the radius, then it is one of the simply connected spaces of constant curvature. This generalizes an earlier result of the first author and D. Kunszenti-Kovács (2010). 相似文献
73.
74.
We shall prove thatf
1 =x
2 +y
4 + 7z
2 represents all eligible numbers congruent to 2 mod 3 except 14 × 72k which was conjectured by Kanplansky. Our method is to use modular forms of weight 3/2. Our method can also be applied to
other ternary quadratic forms. 相似文献
75.
76.
《复变函数与椭圆型方程》2012,57(9):753-766
In this article some problems related to the Krzy? conjecture are discussed. In particular, we prove the Krzy? conjecture for the fifth coefficient. 相似文献
77.
Daniel Macias Castillo 《Journal of Number Theory》2013,133(9):3007-3032
We discuss an explicit refinement of Rubin?s integral version of Stark?s conjecture. We prove that this refinement is a consequence of the relevant case of the Equivariant Tamagawa Number Conjecture of Burns and Flach, hence obtaining a full proof in several important cases. We also derive several explicit consequences of this refinement concerning the annihilation as Galois modules of ideal class groups by explicit elements constructed from the values of higher order derivatives of Dirichlet L-functions. We finally describe the relation between our approach and those found in recent work of Emmons and Popescu and of Buckingham. 相似文献
78.
William N. Traves 《Proceedings of the American Mathematical Society》1999,127(8):2245-2248
The notion of D-simplicity is used to give a short proof that varieties whose normalization is smooth satisfy Ishibashi's extension of Nakai's conjecture to arbitrary characteristic. This gives a new proof of Nakai's conjecture for curves and Stanley-Reisner rings.
79.
N. Sh. Zagirov 《Mathematical Notes》1999,65(1):51-58
In this paper we find the pairs of functionsg, G (g<G) such that the maximum length of the graph of polynomials of given degree contained betweeng andG is attained on one of the two snakes generated by the functionsg andG.
Translated fromMatematicheskie Zametki, Vol. 65, No. 1, pp. 61–69, January, 1999. 相似文献
80.
We consider a single server loss system in which arrivals occur according to a doubly stochastic Poisson process with a stationary
ergodic intensity functionλ
t
. The service times are independent, exponentially distributed r.v.'s with meanμ
−1, and are independent of arrivals. We obtain monotonicity results for loss probabilities under time scaling as well as under
amplitude scaling ofλ
t
. Moreover, using these results we obtain both lower and upper bounds for the loss probability. 相似文献