全文获取类型
收费全文 | 589篇 |
免费 | 17篇 |
国内免费 | 60篇 |
专业分类
力学 | 5篇 |
综合类 | 3篇 |
数学 | 651篇 |
物理学 | 7篇 |
出版年
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 3篇 |
2020年 | 7篇 |
2019年 | 11篇 |
2018年 | 9篇 |
2017年 | 4篇 |
2016年 | 1篇 |
2015年 | 8篇 |
2014年 | 21篇 |
2013年 | 55篇 |
2012年 | 23篇 |
2011年 | 37篇 |
2010年 | 33篇 |
2009年 | 55篇 |
2008年 | 45篇 |
2007年 | 46篇 |
2006年 | 34篇 |
2005年 | 39篇 |
2004年 | 31篇 |
2003年 | 18篇 |
2002年 | 27篇 |
2001年 | 13篇 |
2000年 | 22篇 |
1999年 | 15篇 |
1998年 | 17篇 |
1997年 | 15篇 |
1996年 | 16篇 |
1995年 | 10篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1978年 | 5篇 |
排序方式: 共有666条查询结果,搜索用时 15 毫秒
71.
我们在无限维空间中研究微分包含的生存W—单调轨道的存在性.基于Zorn引理,我们给出了一个逼近方法,在较弱的条件下得到了一个存在性定理,其特殊情形则包含了已有的生存定理和微分方程理论中的若干结果作为应用,我们首先研究了微分包含生存解的整体存在性,得到了整体生存理.然后我们研究了微分包含解的稳定性,得到一些新的结果. 相似文献
72.
We consider the problem of finding solutions of systems of monotone equations. The Newton-type algorithm proposed in Ref. 1 has a very nice global convergence property in that the whole sequence of iterates generated by this algorithm converges to a solution, if it exists. Superlinear convergence of this algorithm is obtained under a standard nonsingularity assumption. The nonsingularity condition implies that the problem has a unique solution; thus, for a problem with more than one solution, such a nonsingularity condition cannot hold. In this paper, we show that the superlinear convergence of this algorithm still holds under a local error-bound assumption that is weaker than the standard nonsingularity condition. The local error-bound condition may hold even for problems with nonunique solutions. As an application, we obtain a Newton algorithm with very nice global and superlinear convergence for the minimum norm solution of linear programs.This research was supported by the Singapore-MIT Alliance and the Australian Research Council. 相似文献
73.
Chuan Liu 《Topology and its Applications》2005,150(1-3):91-99
In this paper, we give an affirmative answer to Tanaka's question: Is a space X with a σ-hereditarily closure-preserving weak base g-metrizable? [Proc. Aroc. Amer. Math. Soc. 112 (1991) 283] and a negative answer to S. Lin's question: Is every weak base of a topological space a k-network? [S. Lin, Generalized Metric Spaces and Maps, Science Press, 1995, Problem 1.6.20]. We also discuss mapping theorems on weak bases and the product of weak bases. 相似文献
74.
Lijing Chen 《Journal of Mathematical Analysis and Applications》2006,318(2):726-741
This paper discusses nonlinear boundary value problem for first order impulsive functional differential equations. We establish several existence results by using the lower and upper solutions and monotone iterative techniques. Two examples are discussed to illustrate the efficiency of the obtained results. 相似文献
75.
Luis A. Sanchez 《Journal of Mathematical Analysis and Applications》2006,317(1):71-79
The theory of cooperative and competitive systems is used to study the dynamical behaviour of the modified Michaelis-Menten system. Conditions for convergence to equilibria and existence of stable closed orbits are given, improving previous results obtained in [R.A. Smith, Some modified Michaelis-Menten equations having stable closed orbits, Proc. Roy. Soc. Edinburgh Sect. A 109 (1988) 341-359]. 相似文献
76.
S. V. Sudoplatov 《Algebra and Logic》2006,45(3):180-200
Previously, we obtained a syntactic characterization for the class of complete theories with finitely many pairwise non-isomorphic
countable models [1]. The most essential part of that characterization extends to Ehrenfeucht theories (i.e., those having
finitely many (but more than 1) pairwise non-isomorphic countable models). As the basic parameters defining a finite number
of countable models, Rudin-Keisler quasiorders are treated as well as distribution functions defining the number of limit
models for equivalence classes w.r.t. these quasiorders. Here, we argue to state that all possible parameters given in the
characterization theorem in [1] are realizable. Also, we describe Rudin-Keisler quasiorders in arbitrary small theories. The
construction of models of Ehrenfeucht theories with which we come up in the paper is based on using powerful digraphs which,
along with powerful types in Ehrenfeucht theories, always locally exist in saturated models of these theories.
Supported by RFBR grant Nos. 02-01-00258 and 05-01-00411.
__________
Translated from Algebra i Logika, Vol. 45, No. 3, pp. 314–353, May–June, 2006. 相似文献
77.
L—Fuzzy拓扑空间中的可数F紧性与几乎可数F紧性 总被引:1,自引:0,他引:1
本文在L-uzzy拓扑空间中引入可数F紧性与几乎可数F紧性的概念,并讨论了它们的性质及其相互关系。 相似文献
78.
79.
80.