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51.
Holly Bernstein 《Transactions of the American Mathematical Society》2001,353(6):2245-2274
This article examines isothermic surfaces smoothly immersed in Möbius space. It finds explicit examples of non-special, non-canal isothermic tori with spherical lines of curvature in two systems by analyzing Darboux transforms of Dupin tori. In addition, it characterizes the property of spherical lines of curvature in terms of differential equations on the Calapso potential of the isothermic immersion, and investigates the effect of classical transformations on this property.
52.
Claire Voisin 《Japanese Journal of Mathematics》2007,2(2):261-296
I will discuss positive and negative results on the Hodge conjecture. The negative aspects come on one side from the study
of the Hodge conjecture for integral Hodge classes, and on the other side from the study of possible extensions of the conjecture
to the general K?hler setting. The positive aspects come from algebraic geometry. They concern the structure of the so-called
locus of Hodge classes, and of the Hodge loci.
This article is based on the 1st Takagi Lectures that the author delivered at Research Institute for Mathematical Sciences,
Kyoto University on November 25 and 26, 2006. 相似文献
53.
丁旭 《浙江大学学报(理学版)》2004,31(3):349-353
通过对地域个性的本质、影响个性的相关因子及个性创作的原则的分析,提出了创造居住空间个性的关键是打破固有化的设计思维模式、保护本土特征、考虑人文因素、寻求方案的突破点以及体现时代精神等几个方面,并结合实例作了进一步的阐释. 相似文献
54.
Chong LI Genaro LOPEZ 《数学学报(英文版)》2006,22(3):741-750
Let B (resp. K, BC,KC) denote the set of all nonempty bounded (resp. compact, bounded convex, compact convex) closed subsets of the Banach space X, endowed with the Hausdorff metric, and let G be a nonempty relatively weakly compact closed subset of X. Let B° stand for the set of all F ∈B such that the problem (F, G) is well-posed. We proved that, if X is strictly convex and Kadec, the set KC ∩ B° is a dense Gδ-subset of KC / G. Furthermore, if X is a uniformly convex Banach space, we will prove more, namely that the set B /B° (resp. K / B°, BC /B°, KC / B°) is a-porous in B (resp. K,BC, KC). Moreover, we prove that for most (in the sense of the Baire category) closed bounded subsets G of X, the set K / B° is dense and uncountable in K. 相似文献
55.
David Brink 《Journal of Number Theory》2009,129(2):464-468
Text
It is a theorem of Kaplansky that a prime is representable by both or none of x2+32y2 and x2+64y2, whereas a prime is representable by exactly one of these binary quadratic forms. In this paper five similar theorems are proved. As an example, one theorem states that a prime is representable by both or none of x2+20y2 and x2+100y2, whereas a prime is representable by exactly one of these forms. A heuristic argument is given why there are no other results of the same kind. This argument relies on the (plausible) conjecture that there are exactly 485 negative discriminants Δ such that the class group C(Δ) has exponent 4.Video
For a video summary of this paper, please visit http://www.youtube.com/watch?v=l_yRq0oqKx4. 相似文献56.
57.
Paola Frediani Gian Paolo Grosselli Abolfazl Mohajer 《Mathematische Nachrichten》2023,296(5):1842-1858
In this paper, we construct Shimura subvarieties of dimension bigger than one of the moduli space of δ-polarized abelian varieties of dimension p, which are generically contained in the Prym loci of (ramified) double covers. The idea is to adapt the techniques already used to construct Shimura curves in the Prym loci to the higher dimensional case, namely, to use families of Galois covers of . The case of abelian covers is treated in detail, since in this case, it is possible to make explicit computations that allow to verify a sufficient condition for such a family to yield a Shimura subvariety of . 相似文献