共查询到18条相似文献,搜索用时 93 毫秒
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本文定义了一个由范畴 RMRl到范畴A Grn0 的函子G,并证明了函子G保持分量正合及全正合,关于范畴AGGrn0 证明了定理: 相似文献
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本文给出了Oh点群表象中的d2,8(C3v*)完全强场矩阵,并借助于这种矩阵的特征值和特征矢量,建立了CsMgX3:Ni2+(X=Cl,B,I)类晶体的全组态混合EPR理论。应用这一理论,对CsMgCl3晶体中的Ni2+杂质离子的光学吸收谱、基态零场分裂参量D、顺磁g因数、基态Zeeman分裂以及EPR条件(B,hv0)进行了统一的计算。结果与观测非常一致,从而首次对CsMgCl3:Ni2+的光、磁性质作出了统一的理论解释。 相似文献
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本文我们引入了函数类Bδ(G//K)={φ∈L1(G//K)||φ(t)|≤Δ-1(t)(1+t)1-δ,δ>0),对f∈Lp(G//K),1≤p≤∞,和极大算子(?),证明了这类算子是(H∞,s1,L1)型的. 相似文献
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We consider diffusive limit of the Boltzmann equation in a periodic box. We establish L6 estimate for the hydrodynamic part Pf of particle distribution function, which leads to uniform bounds global in time. 相似文献
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基础R0-代数的性质及在L*系统中的应用 总被引:5,自引:1,他引:4
研究了王国俊教授建立的模糊命题演算的形式演绎系统L*和与之在语义上相关的R0-代数,提出了基础R0-代数的观点并讨论了其中的一些性质,在将L*系统中的推演证明转化为相应的R0-代数中的代数运算方面作了一些尝试,作为它的一个应用,证明了L*系统中的模糊演绎定理。 相似文献
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In this paper we discuss a relatively general kind of iterative functional equation G(x,f(x), ...,f
n
(x)) = 0 (for allx ∈J), whereJ is a connected closed subset of the real number axis ℝ,G∈C
m
(J
n+1, ℝ) andn ≥ 2. Using the method of approximating fixed points by small shift of maps, choosing suitable metrics on functional spaces
and finding a relation between uniqueness and stability of fixed points of maps of general spaces, we prove the existence,
uniqueness and stability ofCm solutions of the above equation for any integer m ≥ 0 under relatively weak conditions, and generalize related results in
reference in different aspects. 相似文献
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Nicholas Tzanakis 《Journal of Number Theory》1982,15(3):376-387
It is proved that the equation of the title has a finite number of integral solutions (x, y, n) and necessary conditions are given for (x, y, n) in order that it can be a solution (Theorem 2). It is also proved that for a given odd x0 there is at most one integral solution (y, n), n ≥ 3, to x03 + 3y3 = 2n and for a given odd y0 there is at most one integral solution (x, n), n ≥ 3, to x3 + 3y03 = 2n. 相似文献
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The simplest case of Fermat's last theorem, the impossibility of solving x3 + y3 = z3 in nonzero integers, has been proved. In other words, 1 is not expressible as a sum of two cubes of rational numbers. However, the slightly extended problem, in which integers D are expressible as a sum of two cubes of rational numbers, is unsolved. There is the conjecture (based on work of Birch, Swinnerton-Dyer, and Stephens) that x3 + y3 = D is solvable in the rational numbers for all square-free positive integers D ≡ 4 (mod 9). The condition that D should be square-free is necessary. As an example, it is shown near the end of this paper that x3 + y3 = 4 has no solutions in the rational numbers. The remainder of this paper is concerned with the proof published by the first author (Proc. Nat. Acad. Sci. USA., 1963) entitled “Remarks on a conjecture of C. L. Siegel.” This pointed out an error in a statement of Siegel that the diophantine equation ax3 + bx2y + cxy2 + dy3 = n has a bounded number of integer solutions for fixed a, b, c, d, and, further, that the bound is independent of a, b, c, d, and n. However, x3 + y3 = n already has an unbounded number of solutions. The paper of S. Chowla itself contains an error or at least an omission. This can be rectified by quoting a theorem of E. Lutz. 相似文献
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Ferenc Móricz 《Analysis Mathematica》2005,31(1):31-41
Summary A multivariate Hausdorff operator H = H(, c, A) is defined in terms of a -finite Borel measure on Rn, a Borel measurable function c on Rn, and an n × n matrix A whose entries are Borel measurable functions on rn and such that A is nonsingular -a.e. The operator H*:= H (, c | det A-1|, A-1) is the adjoint to H in a well-defined sense. Our goal is to prove sufficient conditions for the boundedness of these operators on the real Hardy space H1(Rn) and BMO (Rn). Our main tool is proving commuting relations among H, H*, and the Riesz transforms Rj. We also prove commuting relations among H, H*, and the Fourier transform. 相似文献
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Horst von Lienen 《Journal of Number Theory》1978,10(1):10-15
Using known properties of continued fractions, we give a very simple and elementary proof of the theorem of Epstein and Rédei on the impossibility in a certain case of representing ?1 by the quadratic form x2 ? 2py2. Two of our theorems, which concern the representation of a2 and ?2a2, serve to extend our method to an unknown case in which ?1 is not representable. 相似文献