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Реэуме. Вводятся понятия обобшеннои частнои проиэводнои и обобшенного оератора Лапласа для функции многих переменных. Докаэана теоремы типа теоремы Фату о граничных своиствах частхых проиэводных интегралал Пуассона для полупространства, когда плотностя интеграла имеет обобшеннуу частнуу проиэводнуу и обобшенныи оператор Лапласа. 相似文献
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证明如果T是L∞(Ω1,A,μ)到L∞(Ω2,B,ν)内的同构且满足‖T‖·‖T -1‖≤1+ε, ε∈(0,1/5),则在一定条件下‖T/T‖接近于一个等距,其误差小于6ε. 相似文献
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Erd?s and Sós conjectured in 1963 that ifGis a graph of ordernand sizee(G) with, thenGcontains every treeTof sizek. We prove the conjecture in the case whereGdoes not contain the cycleC4. 相似文献
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本文确定了正交群PO4+(V),PO4′(V)及PΩ4(V)的自同构,指出了一类新的例外自同构的存在.从而解决了域上典型群同构理论中最后一个公开问题. 相似文献
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对新概念指导下而设计的 (La1-xSrx)2Cu1-xSnxO4超导体进行了119Sn MÖssbauer谱研究 .对不同掺杂量样品的系统研究表明 ,MÖssbauer谱实验结果进一步证实了Sn以Sn4+价态存在并占据Cu晶位 ,不存在占据La晶位的Sn2 +离子 .Sn4+离子附近的局域晶格畸变较小 ,但是随Sn掺杂量有增加趋势 .在对La2 CuO4母体进行Sr和Sn同时掺杂所引入的载流子对超导电性的影响存在新的机制 .在新的额外氧机制下 ,讨论了Sn掺杂所导致的额外氧对超导电性的影响 . 相似文献
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Ioannis A. Polyrakis 《Journal of Mathematical Analysis and Applications》2004,289(1):126-142
In this article we suppose that (Ω,Σ,μ) is a measure space and T an one-to-one, linear, continuous operator of L1(μ) into the dual E′ of a Banach space E. For any measurable set A consider the image T(L+1(μA)) of the positive cone of the space L1(μA) in E′, where μA is the restriction of the measure μ on A. We provide geometrical conditions on the cones T(L+1(μA)) which yield that the measure μ is atomic, i.e., that L1(μ) is lattice isometric to , where denotes the set of atoms of μ. This result yields also a new characterization of c0(Γ). 相似文献
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本文用X射线粉末衍射和电子衍射的方法,研究了Ce-Fe-B合金中的富B相Ce1+εFe4B4的晶体结构,发现该化合物具有一种罕见的晶体结构——烟囱-梯子型的一维成分无公度结构,是由两套亚结构即Fe-B亚结构和Ce亚结构所组成,两套亚结构都具有四方对称性,其点阵常数α值相同。Ce1+εFe4B4在室温的点阵常数α=0.7068 nm,cFe-B=0.3902 nm,cCe=0.3440 nm。在950℃粉末淬炼后的点阵常数α=0.7065nm,cFe-B=0.3887 nm,cCe=0.3563 nm。Fe-B亚结构的空间群为P42/ncm,Ce亚结构的空间群为I4/mmm。 相似文献
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Yang Li Guohui Cao Ruifei Duan Guangcan Che Zhongxian Zhao J. A. Larrea J E. M. Baggio-Saitovitch 《中国科学A辑(英文版)》2000,43(4):400-406
119Sn M?ssbauer research is carried out on (La1-xSrx),Cu1-xSnxO4(x = 0.075 and 0.110) superconductors which are designed under a new concept. The M?ssbauer spectra results show that Sn occupies
Cu position in Sn4+ state, and there is no Sn2+ ion occupying La position. The local lattice deformation near Sn4+ site is small, but displays an increasing tendency with Sn doping. For La2CuO4 matrix, the simultaneous dopings of Sr/Sn induce holes and electrons on CuO2 layer in a new mechanism which influences superconductivity. Under a new mechanism of extra oxygen, the extra oxygen effect
of Sn-doping on superconductivity is discussed 相似文献
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We present some properties of the distributions T of the form ∑i (δpi−δni), with ∑i d(pi,ni)<∞, which arise in the study of the 3-d Ginzburg–Landau problem; see Bourgain et al. (C. R. Acad. Sci. Paris, Ser. I 331 (2000) 119–124). We show that there always exists an irreducible representation of T. We also extend a result of Smets (C. R. Acad. Sci. Paris, Ser. I 334 (2002) 371–374) which says that T is a measure iff T can be written as a finite sum of dipoles. 相似文献
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《K-Theory》2005,35(3-4):375-394
We discuss the local index formula of Connes–Moscovici for the isospectral noncommutative geometry that we have recently constructed
on quantum SU(2). We work out the cosphere bundle and the dimension spectrum as well as the local cyclic cocycles yielding the index formula.
(Received: January 2005) 相似文献
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本文首先讨论空间l1(Xn)中的弱收敛性,然后给出了l1(Xn)中弱紧性的几种等价刻画,同时对lp(Xn)(1<p<∞)中的弱紧性也得到了类似的结果. 相似文献
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In this article, we study the following initial value problem for the nonlinear equation 相似文献
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设G为有限群,如对每个质数r都有|NG(R1)|=|N(Un(q))(R2)|,那么G≌Un(q),此处R1∈Sylr(G),R2∈Sylr(Un(q)),n=4或5. 相似文献
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