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131.
预加法范畴中态射的(1,...,i)—逆 总被引:3,自引:0,他引:3
庄瓦金 《新疆大学学报(理工版)》1992,9(1):38-43
在文[7]基础上,本文研究了预加法范畴中态射的(1,…,i)一逆,证得了这些广义逆的全套表达式,从而得到了一些特殊态射广义逆的相应结果。 相似文献
132.
133.
We prove that the category of -manifolds has all finite products. Further, we show that a -manifold (resp., a -morphism) can be reconstructed from its algebra of global -functions (resp., from its algebra morphism between global -function algebras). These results are of importance in the study of Lie groups. The investigation is all the more challenging, since the completed tensor product of the structure sheafs of two -manifolds is not a sheaf. We rely on a number of results on (pre)sheaves of topological algebras, which we establish in the appendix. 相似文献
134.
E. Cuchillo-Ibá ñ ez J. Dydak A. Koyama M. A. Moró n 《Transactions of the American Mathematical Society》2008,360(10):5229-5246
Motivated by the Chapman Complement Theorem, we construct an isomorphism between the topological category of compact Z-sets in the Hilbert cube and the -coarse category of their complements. The -coarse morphisms are, in this particular case, intrinsically related to uniformly continuous proper maps. Using that fact we are able to relate in a natural way some of the topological invariants of Z-sets to the geometry of their complements.
135.
本文讨论预加法范畴中态射的广义Moore-Perurose逆.给出了具有泛分解态射的广义Moore-Penrose逆存在的几个充要条件,并把结果应用到环上的矩阵中. 相似文献
136.
设A是由箭图Q和关系I所确定的代数,D(A)是代数A的对偶扩张代数, 对应的箭图Q*和关系I*由Q和I决定.本文证明:带关系箭图(Q*,I*)的自同构由带关系箭图(Q,I)的自同构决定;D(A)的Frobenius态射由A的Frobenius态射完全决定;代数D(A)的固定点代数同构于相应的代数A的固定点代数与A°P的固定点代数的张量积,特别地,当Q为单的箭图时,代数D(A)的固定点代数同构于代数A的固定点代数的对偶扩张代数. 相似文献
137.
该文在点标拓扑空间范畴中引进了(i,p)-同伦逆和群同伦逆的概念,并讨论了它们存在的条件和性质. 相似文献
138.
Radu Pantilie John C. Wood 《Transactions of the American Mathematical Society》2002,354(10):4229-4243
We prove that, from an Einstein manifold of dimension greater than or equal to five, there are just two types of harmonic morphism with one-dimensional fibres. This generalizes a result of R.L. Bryant who obtained the same conclusion under the assumption that the domain has constant curvature.
139.
ZHAO Yicai 《数学年刊B辑(英文版)》2001,22(2):255-262
61. IntroductionLetM be an n-dimensional normal projective variety with only Q-Gorenstein, terminalsingUlarities and letL be an ample line bundle on M. KM denotes the canonical divisor, orthe canonical sheaf of M. Assume that KM is not nef. The ne f value of (M, L) is a realnUmber defined as follows:.T = min{r E RIKM rL is ne f }.By the Kawamata rationality theorem, T is a rational number and by the KawamataShokurov base point free theorem, lin(KM AL)l is base point free for m>… 相似文献
140.
We consider an integrable three-dimensional system of ordinary differential equations introduced by S. V. Kovalevskaya in a letter to G. Mittag-Leffler. We prove its isomorphism with the three-dimensional Euler top, and propose two integrable discretizations for it. Then we present an integrable generalization of the Kovalevskaya system, and study the problem of integrable discretization for this generalized system. 相似文献