全文获取类型
收费全文 | 554篇 |
免费 | 13篇 |
国内免费 | 74篇 |
专业分类
化学 | 1篇 |
力学 | 5篇 |
综合类 | 26篇 |
数学 | 590篇 |
物理学 | 19篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 2篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 8篇 |
2017年 | 10篇 |
2016年 | 10篇 |
2015年 | 3篇 |
2014年 | 15篇 |
2013年 | 46篇 |
2012年 | 14篇 |
2011年 | 25篇 |
2010年 | 24篇 |
2009年 | 34篇 |
2008年 | 34篇 |
2007年 | 38篇 |
2006年 | 33篇 |
2005年 | 37篇 |
2004年 | 22篇 |
2003年 | 41篇 |
2002年 | 39篇 |
2001年 | 32篇 |
2000年 | 27篇 |
1999年 | 32篇 |
1998年 | 26篇 |
1997年 | 20篇 |
1996年 | 15篇 |
1995年 | 6篇 |
1994年 | 9篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有641条查询结果,搜索用时 10 毫秒
41.
Eknath Ghate 《Compositio Mathematica》2002,132(3):243-281
Let f be a primitive Hilbert modular cusp form of arbitrary level and parallel weight k, defined over a totally real number field F. We define a finite set of primes
that depends on the weight and level of f, the field F, and the torsion in the boundary cohomology groups of the Borel–Serre compactification of the underlying Hilbert-Blumenthal variety. We show that, outside
, any prime that divides the algebraic part of the value at s=1 of the adjoint L-function of f is a congruence prime for f. In special cases we identify the boundary primes in terms of expressions of the form
, where is a totally positive unit of F. 相似文献
42.
集对Fuzzy格及其在格表示论中的应用 总被引:1,自引:0,他引:1
用幂集格构造了集对 Fuzzy 格(这与用整数对构造有理数集有相似之处),并用它证明了完整的软代数表示定理,即定义了到自身的映射且有最大元和最小元的格为软代数的充要条件是它与某个集对 Fuzzy 格的子格同构.这样,与分配格在幂集 Boole 格中表示相对应,软代数在集对 Fuzzy 格中有表示,在理论上是很完美的 相似文献
43.
Friedrich Wehrung 《Proceedings of the American Mathematical Society》1999,127(2):363-370
The Congruence Lattice Problem asks whether every algebraic distributive lattice is isomorphic to the congruence lattice of a lattice. It was hoped that a positive solution would follow from E. T. Schmidt's construction or from the approach of P. Pudlák, M. Tischendorf, and J. Tuma. In a previous paper, we constructed a distributive algebraic lattice with compact elements that cannot be obtained by Schmidt's construction. In this paper, we show that the same lattice cannot be obtained using the Pudlák, Tischendorf, Tuma approach.
The basic idea is that every congruence lattice arising from either method satisfies the Uniform Refinement Property, that is not satisfied by our example. This yields, in turn, corresponding negative results about congruence lattices of sectionally complemented lattices and two-sided ideals of von Neumann regular rings.
44.
Christopher?J.?FewsterEmail author Izumi?ojima Martin?Porrmann 《Letters in Mathematical Physics》2005,73(1):1-15
In this Letter we try to settle some confused points concerning the use of the notion of p-nuclearity in the mathematical and physical literature, pointing out that the nuclearity index in the physicists’ sense vanishes for any p> 1. Our discussion of these issues suggests a new perspective, in terms of ε-entropy and operator spaces, which might permit connections to be drawn between phase space criteria and quantum energy inequalities.Mathematics Subject Classification (2000): 81T05, 47B10, 47L25. 相似文献
45.
D. M. Smirnov 《Algebra and Logic》2004,43(4):249-257
For integers 1 m < n, a Cantor variety with m basic n-ary operations i and n basic m-ary operations k is a variety of algebras defined by identities k(1(
), ... , m(
)) =
k and i(1(
), ... ,n(
)) = y
i, where
= (x
1., ... , x
n) and
= (y
1, ... , y
m). We prove that interpretability types of Cantor varieties form a distributive lattice, , which is dual to the direct product 1 × 2 of a lattice, 1, of positive integers respecting the natural linear ordering and a lattice, 2, of positive integers with divisibility. The lattice is an upper subsemilattice of the lattice
of all interpretability types of varieties of algebras. 相似文献
46.
In this paper we introduce the notion of operator semirings of a -semiring to study -semirings. It is shown that the lattices of all left (right) ideals (two-sided ideals) of a -semiring and its right (respectively left) operator semiring are isomorphic. This has many applications to characterize various -semirings.AMS Subject Classification (2000): 16Y60, 16Y99 相似文献
47.
Generalized Bicyclic Semigroups and Jones Semigroups 总被引:1,自引:0,他引:1
In this paper, we consider the generalized bicyclic semigroups Bn = a, b | anb = 1 and the Jones semigroups An = a, b | an+1b = a. They are the generalizations of the bicyclic semigroup B = a, b | ab = 1 and its analogous semigroup A = a, b | a2b = a discovered by P.R., Jones in 1987. The word problem for these kinds of semigroups is solved. It is proved that, for n 2, Bn are bisimple right inverse but not inverse semigroups and that the semigroup C = a, b | a2b = a, ab2 = b is the smallest idempotent-free homomorphic image of An. Moreover, we also prove that An and Am are mutually embeddable but not isomorphic with each other if n m. As a consequence, different kind of
-nontrivial [0-]simple semigroups without idempotents are discussed.AMS 1991 Subject Classification: primary 20M10 secondary 20M05.Supported by NNSF of China (19671063) and KSRF of Sichuan Education Committee ([1999]127). 相似文献
48.
Some congruences on S (X) are investigated in this paper. A unique atom in the sublattice [C(E), C (E)] is determined for some spaces X and S-equivalences E and X.AMS Subject Classification (1991): 20M20 54H15 相似文献
49.
S. Tazhetdinov 《Siberian Mathematical Journal》2008,49(1):175-179
We describe the subnormal subgroups of 2-dimensional linear groups over local and full rings in which 2 is invertible, as well as the subnormal subgroups of symplectic groups over local rings in which 2 is invertible. 相似文献
50.
沈康身 《浙江大学学报(理学版)》1986,13(4):421-434
《数书九章》是我国著名数学家南宋秦九韶撰写(公元1247年)。青年时他“侍亲中都(临安,今杭州市)因得访习于太史(国家天文历法官员)”。《数书九章》有“大衍总数术”以处理天文历法问题,系统论述同余式解法,这在我国历史上是第一次,在世界数学史上也是创举。 本文用整数论知识来检验《数书九章》中有关解同余式算题(大衍类)题文、术文、草文以及清代学者所作注文的得失,使对我国传统数学在这一领域内的工作有,较系统的认识。 相似文献