排序方式: 共有53条查询结果,搜索用时 968 毫秒
21.
D. Gaier 《Constructive Approximation》1998,14(1):27-40
Let G be a finite domain, bounded by a Jordan curve Γ , and let f
0
be a conformal map of G onto the unit disk. We are interested in the best rate of uniform convergence of polynomial approximation to f
0
, in the case that Γ is piecewise-analytic without cusps. In particular, we consider the problem of approximating f
0
by the Bieberbach polynomials π
n
and derive results better than those in [5] and [6] for the case that the corners of Γ have interior angles of the form π/N . In the proof, the Lehman formulas for the asymptotic expansion of mapping functions near analytic corners are used. We
study the question when these expansions contain logarithmic terms.
December 6, 1995. Date revised: August 5, 1996. 相似文献
22.
设 $p\geq 7$ 为任意奇素数. 证明了当 $3\leq s
相似文献
23.
刘秀贵 《数学物理学报(A辑)》2007,27(5):802-810
令 p>5 是素数, A 表示模 p Steenrod代数, S 表示球谱的 p 局部化. 首先给出了有关May谱序列的一些重要定理, 然后作为应用, 利用May谱序列和Adams谱序列发觉了一族新的非零的球面稳定元素. 该新元素族次数为2(p-1)(pn+sp2+sp+s)-7,在Adams谱序列中由 bn-1g0γs∈ ExtAs+4,﹡( ZpZp)所表示, 其中n≥4, 3≤s
24.
By a method improving that of [1], the authors prove the existence of a non-trivial product of filtration, s + 6, in the stable homotopy groups of sphere, πt-6S, which is represented up to non-zero scalar by β^-s+2ho(hmbn-1 -hnbm-1) ∈ ExtA^s+6,t+s(Zp, Zp) in the Adams spectral sequence, where p ≥ 7, n ≥ m + 2 ≥ 5, q = 2(p- 1), 0 ≤ s 〈 p - 2, t= (s + 2 + (s + 2)p + p^m + p^n)q. The advantage of this method is to extend the range of s without much complicated argument as in [1]. 相似文献
25.
To determine the stable homotopy groups of spheres π*(S) is one of the central problems in homotopy theory. Let p be a prime greater than 5. The authors make use of the May spectral sequence and the Adams spectral sequence to prove the existence of a ?n-related family of homotopy elements, β1ωnγs, in the stable homotopy groups of spheres, where n > 3, 3 ≤ s < p ? 2 and the ?n-element was detected by X. Liu. 相似文献
26.
Xiu Gui LIU 《数学学报(英文版)》2007,23(3):385-392
In this paper, some groups Ext A^s.t (Zp, Zp) with specialized s and t are first computed by the May spectrM sequence. Then we make use of the Adams spectral sequence to prove the existence of a new nontrivial family of filtration s+5 in the stable homotopy groups of spheres πpnq+(s+3)pq+(s+1)q-5S which is represented (up to a nonzero scalar) by β+2bohh∈ExtA^s+5,P^nq+(n+3)pq+(n+1)q+s(Zp, Zp) in the Adams spectral sequence, where p ≥ 5 is a prime number, n ≥3, 0≤ s 〈 p - 3, q = 2(p - 1). 相似文献
27.
28.
Abstract This paper computes the Thom map on γ2 and proves that it is represented by 2b2,0h1,2 in the ASS. The authors also compute the higher May differential of b2,0, from which it is proved that
for 2 ≤ s < p - 1 are permanent cycles in the ASS.
* Project supported by the National Natural Science Foundation of China (No.10501045), the Tianyuan Foundation of Mathematics
(No.10426028) and the Fund of the Personnel Division of Nankai University. 相似文献
29.
Lih-Ing W. Roeger 《Journal of Difference Equations and Applications》2013,19(8):773-790
A discretization method attributed to Kahan is used to approximate the May–Leonard (M–L) competition model for three species. The local dynamics of this discrete-time M–L model are analyzed. This model differs from the discrete M–L models being studied previously. This discrete model shows dynamical consistency with the continuous M–L model. Numerically, we showed that the discrete M–L model has a degenerate Hopf-bifurcation, which is consistent with the continuous M–L model. 相似文献
30.
铈(Ⅲ)离子掺杂邻苯二甲酸钙荧光材料的红外光谱分析 总被引:2,自引:0,他引:2
采用溶液反应法合成了掺杂不同摩尔比Ce(Ⅲ)离子的邻苯二甲酸钙荧光材料,测定了基质及荧光体的红外光谱,进行了分析和指认,讨论了掺杂离子Ce(Ⅲ)对这些荧光材料红外光谱的影响。 相似文献