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1.
一类环上HX环的结构   总被引:11,自引:2,他引:9  
自李洪兴1991年提出了HX环以来,人们一直有这么一个问题没解决,就是是否存在非平凡的HX环的例子?但至今既没找到非平凡的HX环,也没有证明任一环R仅存在平凡的HX环。针对这个问题,本文提出并证明了一类环仅有平凡HX环,还给出了一系列的结构定理。这样,既为证明任一环R仅有平凡的HX环的猜想有新的启示,也为人们指明无须在这一类环上寻找非平凡HX环。  相似文献   

2.
龚致宾  楼红卫 《大学数学》2021,37(5):120-124
在中值定理类双介值问题的命题中,很多命题者没有注意到结论的平凡性.文章借助于微分Darboux定理,证明了对应的非平凡问题解的存在性.  相似文献   

3.
裴瑞昌 《数学学报》2022,(6):1045-1056
本文研究一类具有次临界多项式增长或次临界指数型(临界指数型)增长的(p,2)-拉普拉斯方程一个正解及无穷多非平凡解的存在性,运用山路定理及喷泉定理,得到了拉普拉斯方程非平凡解的一些存在性结果.  相似文献   

4.
朱彬 《数学学报》1997,40(3):423-428
设X是局部有限偏序集(或拟序集),R是含1的结合环,Ⅰ(X,R)是R上X的关联环,关联环的同构问题是指:问题1:怎样的环,能使环同构Ⅰ(X,R)Ⅰ(X,R)推出偏序集之间的同构X芒X’?问题2:怎样的环或偏序集,能使环同构Ⅰ(X,R)Ⅰ(X,S)推出R S?本文证明了对唯一幂等元环(非交换),问题1有正面回答;对问题2,我们证明了对交换不可分解环R、S,由环同构Ⅰ(X,R)Ⅰ(X,R)可得到R=S,X=X’。  相似文献   

5.
本文研究了一类渐近线性椭圆问题解的存在性.通过环绕定理,得到了此问题存在一个非平凡解.
Abstract:
In this article,we study the existence of solutions to an asymptotically linear elliptic problem.By the linking theorem,we obtain that such problem has a nontrivial solution.  相似文献   

6.
本文研究一类双相问题多重解的存在性.基于变分方法,证明了该问题至少存在两个非平凡解.当非线性项关于u是奇函数,利用对称山路引理,我们同时得到了该问题存在无穷多对解.  相似文献   

7.
本文研究了一类非局部椭圆方程非平凡弱解的存在性问题.利用Nehari流形及纤维环映射,获得了该问题正解的存在性条件,推广了该领域的相关结果.  相似文献   

8.
在没有Landesman-Lazer型约束条件的情况下,本文获得了一类涉及第一特征值的拟线性强振动方程非平凡解的存在性.  相似文献   

9.
本文主要证明了(1)当G是有限群时,G-型分次环R是gr-正则的当且仅当RG是正则的当且仅当M_G(R)是gr-正则的当且仅当对每个和G的任意非空子集H和F,M_(HXF)(R)的每个矩阵都有1-逆。(2)当G是任意群,G-型分次环只是反gr-正则的当且仅当F是反正则的当且仅当对每个和G的任意作非空子集H和K,FM_(H×F)(R)的每个矩阵有2-逆当且仅当FM_G(R)是gr-反正则的。  相似文献   

10.
利用Fadell与Rabinowitz提出的同调指标理论,研究了一类带不定权非线性边界的p-Laplacian特征值问题;更进一步,利用环绕定理,证明了一类带跳跃非线性边界的p-Laplacian问题非平凡解的存在性.  相似文献   

11.
For a faithfully flat extension A/B and a right A-module M, we give a new characterization of the set of descent data on M. Assuming that B is a simple Artinian ring and A/B is H-Galois, for a certain finite dimensional Hopf algebra H, we prove that Sweedler's noncommutative cohomology H 1(H?, A) is trivial as a pointed set.  相似文献   

12.
In this paper, we compute the idempotents of the ring $$F_+(G)$$ as defined by Boltje (J Algebra 206:293–343, 1998) in the particular case when the Green biset functor F is such that for all subgroups H of a finite group G, F(H) is a torsion-free ring, finitely-generated as an Abelian group, and has only the trivial idempotents. In this case, the only idempotents in $$F_+(G)$$ are those arising from the Burnside ring B(G).  相似文献   

13.
We show that in an Ore polynomial ring, every left ideal is two-sided only in the trivial commutative case. It is unknown whether the analogous statement about right ideals is true. We establish a variety of restrictions on any putative counterexample.  相似文献   

14.
Following our previous work about quasi-projective dimension [11], in this paper, we introduce quasi-injective dimension as a generalization of injective dimension. We recover several well-known results about injective and Gorenstein-injective dimensions in the context of quasi-injective dimension such as the following. (a) If the quasi-injective dimension of a finitely generated module M over a local ring R is finite, then it is equal to the depth of R. (b) If there exists a finitely generated module of finite quasi-injective dimension and maximal Krull dimension, then R is Cohen-Macaulay. (c) If there exists a nonzero finitely generated module with finite projective dimension and finite quasi-injective dimension, then R is Gorenstein. (d) Over a Gorenstein local ring, the quasi-injective dimension of a finitely generated module is finite if and only if its quasi-projective dimension is finite.  相似文献   

15.
The trivial extensions of a quasi-abelian category by means of a fully exact endofunctor are again quasi-abelian. Using the one-to-one correspondence between quasi-abelian categories and tiltings, it is shown that the trivial extension of a quasi-abelian category corresponds to a trivial extension of the associated tilting. As an application, a criterion for tilting modules over an arbitrary ring R to be liftable to a tilting module over a trivial extension ring R\ltimes M{R\ltimes M} is given.  相似文献   

16.
Malle  Gunter 《Archiv der Mathematik》2019,113(5):449-458
We investigate the upper $$FC-$$ central series of the unit group of an integral group ring $${\mathbb Z}G$$ of a periodic group G. We prove that $${\mathcal U}={{\mathcal U}}_1({\mathbb Z}G)$$ has $$FC-$$ central height one if and only if the $$FC-$$ hypercenter of $${{\mathcal U}}_1({\mathbb Z}G)$$ is contained in the normalizer of the trivial units. Further, in these conditions, the $$FC-$$ hypercenter of the unit group is non-central if and only if G is a $$Q^{*}-$$ group. Let $$H \vartriangleleft {\mathcal U}, H$$ contained in the normalizer of the trivial units, suppose that either the elements of finite order form a subgroup or H is a polycyclic-by-finite (polycyclic) subgroup, then H is contained in the finite conjugacy center of $${{\mathcal U}}_1({\mathbb Z}G)$$ .  相似文献   

17.
研究了无限的NF-环及有限的NF-环,并且给出了有限NF-环的构造.  相似文献   

18.
讨论了在约化条件下,比平凡扩张更广泛的一类扩张环的半交换性.通过给出半交换模的定义,得到平凡扩张是半交换环的一个充要条件.  相似文献   

19.
Liu Zhongkui 《代数通讯》2013,41(6):3031-3040
A proper regular action of the additive group of complex numbers on complex affine space is known to be locally trivial if the coordinate ring of affine space is a flat extension of the ring of G a invariants. Conditions under which a separated action is locally trivial are examined (Section 2) and an algorithm to determine the local triviality of any given action is presented (Section 3).  相似文献   

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