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关于submeso紧空间的映射定理 总被引:4,自引:0,他引:4
证明了在正则空间中闭Lindelof映射保持且逆保持submeso紧性,这改进了林寿关于正则空间完备映射保持且逆保持submeso紧性这一结果;同时我们引用一个反例说明原象空间的正则性是必要的. 相似文献
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《数学的实践与认识》2015,(19)
定义了相对meso紧空间、相对meso-Lindeloff空间的概念,研究了相对meso紧、相对meso-Lindeloff空间在闭Lindeloff映射、完备映射下的性质. 相似文献
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本文证明了,当定义域空间是正则空间时,弱-θ-加细性在闭L映射下是逆保持的,并给出例子说明,去掉定义域空间的正则性,上述结论不成立。 相似文献
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本文证明了,当定义域空间是正则空间时,弱θ^--加细性在闭L映射下是逆保持的,并给出例子说明,去掉定义域空正则性,上述结论不成立。 相似文献
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研究了广义微分结构中的集合方向Mordukhovich法锥、集值映射的方向上导数,以及集合和集值映射的方向序列法紧性的分析法则. 基于集合方向Mordukhovich法锥的交集法则,在方向内半紧性假设下,建立了集合的方向Mordukhovich法锥、集值映射的方向上导数的分析法则.此外,借助Asplund乘积空间中集合的方向序列法紧性的交集法则, 在方向内半紧性和相应的规范条件下,建立了集合和集值映射的(部分)方向序列法紧性的加法、逆像、复合等法则. 相似文献
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仿紧局部cosmic空间的一些性质 总被引:2,自引:0,他引:2
给出仿紧局部cosmic空间的一些特征,建立了仿紧局部cosmic空间的几类序列覆盖L映象的特征,证明了闭L映射和商ss映射保持仿紧局部cosmic空间的性质,此外,还给出仿紧局部cosmic空间的一些映射性质。 相似文献
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让ψ是蕴含仿紧性的映射保持的闭遗传性质.本文建立了仿紧局部ψ空间的闭映象、某些序列覆盖L映象的内在特征的一般性定理,推广了仿紧局部紧空间映象等的若干结论. 相似文献
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We study conformal mappings from the unit disc to one-toothed gear-shaped planar domains from the point of view of the Schwarzian derivative. Gear-shaped (or “gearlike”) domains fit into a more general category of domains we call “pregears” (images of gears under Möbius transformations), which aid in the study of the conformal mappings for gears and which we also describe in detail. Such domains being bounded by arcs of circles, the Schwarzian derivative of the Riemann mapping is known to be a rational function of a specific form. One accessory parameter of these mappings is naturally related to the conformal modulus of the gear (or pregear) and we prove several qualitative results relating it to the principal remaining accessory parameter. The corresponding region of univalence (parameters for which the rational function is the Schwarzian derivative of a conformal mapping) is determined precisely. 相似文献
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本文将Cn中的Roper-Suffridge算子推广到任意复Banach空间中,并证明这种算子在任意复Banach空间中的某些区域上具有保持ε星形性,由此可以构造出任意复Banach空间,复Hilbert空间和Cn中的一些区域上的许多双全纯星形映照、双全纯凸映照、双全纯ε星形映照,同时,得到它们的增长定理等,将龚升与刘太顺,Roper与suffridge,Graham,Kohr等学者在Cn中的一些结果推广到任意复Banach空间或复Hilbert空间中. 相似文献
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In this note we determine the automorphism group of complex manifolds which are proper images of a simply connected strictly pseudoconvex domain in ?n. We also investigate automorphisms of domains invariant under a compact subgroup of complex linear transformations. Furthermore, some regularity and rigidity properties of proper holomorphic mappings are established. In particular we solve a question raised by Hahn and Pflug regarding the nonexistence of proper holomorphic mappings between the euclidian ball and the complex minimal ball of ?n. 相似文献
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Cho‐Ho Chu Hidetaka Hamada Tatsuhiro Honda Gabriela Kohr 《Mathematische Nachrichten》2009,282(2):160-168
We give starlike criteria for a class of rational mappings on the open unit ball of a complex Banach space. We also give a sufficient condition for these mappings to be convex when they are defined in Hilbert spaces. These criteria facilitate the construction of concrete examples of starlike and convex mappings on infinite dimensional domains (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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有界凸平衡域上的双全纯凸映照的判别准则 总被引:2,自引:2,他引:0
本文讨论Cn中有界强凸平衡域和凸平衡域上局部双全纯映照成为双全纯凸映照的充要条件,从而得到Reinhardt域Dp= 上双全纯凸映照的充要条件,其中Pj≥2(j=1,2,…,n). 相似文献
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主要借助于紧覆盖映射、闭映射和商映射讨论了局部紧Lindel(o)f空间的像空间,推导出具有某些特定性质的k系空间的一些刻画,引入强k系的概念给出了局部紧Lindel(o)f空间和仿紧局部紧空间的一种新的等价刻画. 相似文献
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We further study averaged and firmly nonexpansive mappings in the setting of geodesic spaces with a main focus on the asymptotic behavior of their Picard iterates. We use methods of proof mining to obtain an explicit quantitative version of a generalization to geodesic spaces of a result on the asymptotic behavior of Picard iterates for firmly nonexpansive mappings proved by Reich and Shafrir. From this result we obtain effective uniform bounds on the asymptotic regularity for firmly nonexpansive mappings. Besides this, we derive effective rates of asymptotic regularity for sequences generated by two algorithms used in the study of the convex feasibility problem in a nonlinear setting. 相似文献
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In this paper, a class of biholomorphic mappings called complete quasiconvex mappings is introduced and studied in bounded
convex Reinhardt domains of ℂ
n
. Through a detailed analysis of the analytic characterization for this class of mappings, it is shown that this class of
mappings contains the convex mappings and is also a subset of the class of starlike mappings. In the special case of the polydisc,
a decomposition theorem is established for the complete quasiconvex mappings, which in turn is used to derive an improved
sufficient condition for the convex mappings.
Translated from Chinese Annals of Mathematics (Series A) 相似文献
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Andrei V. Dmitruk 《Journal of Mathematical Analysis and Applications》2008,342(2):864-873
The paper is devoted to a revision of the metric regularity property for mappings between metric or Banach spaces. Some new concepts are introduced: uniform metric regularity and metric multi-regularity for mappings into product spaces, when each component is perturbed independently. Regularity criteria are established based on a nonlocal version of Lyusternik-Graves theorem due to Milyutin. The criteria are applied to systems of generalized equations producing some “error bound” type estimates. 相似文献