共查询到18条相似文献,搜索用时 781 毫秒
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SL(2,R)上ωkHα的Fourier变换的渐近性质 总被引:1,自引:0,他引:1
引入了SL(2,R)上的函数类ω^kH^α,利用李代数及其万有包络代数在表示空间中的作用,我们得到了ω^kH^α中的函数的Fourier变换渐近的阶。 相似文献
2.
束立生 《数学物理学报(A辑)》1997,17(2):184-191
该文中,我们主要利用对Lie群G=SL(2,R)上球型函数的一些性质的讨论,给出了G上Fourier变换的一个重要的性质.即对每个γ∈G,存在函数f∈Cc(G),使得f(γ)≠0. 相似文献
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ABOUT THE INVERSION FORMULA ON THE LIE GROUP SL (2, R) 总被引:6,自引:0,他引:6
肖昌柏 《数学物理学报(B辑英文版)》1993,(4)
Harish-Chandra have got a Fourier inversion formula for C_c~-(SL(2, R)). In this paper, we give a discussion on approximation identity kernels on SL(2, R) and get some properties of their Fourier transforms, and then, making use of these properties and Harish-Chandra's result, we prove that the Fourier inversion formula obtained by Harish-Chandra is also valid for C_b~3 (SL(2, R)). 相似文献
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本文在SL(2,R)上引入距离、光滑模、导数等概念,给出了SL(2,R)上的连续函数用Tn和Bσ,n逼近的Jackson型正定理,得到了SL(2,R)上函数的光滑性和最佳逼近阶之间的关系. 相似文献
6.
WangXinsong ZhengWeixing 《分析论及其应用》2003,19(1):76-80
In this paper, a better asymptotic order of Fourier transform on SL(2,R) is obtained by using classical analysis and Lie analysis comparing with that of [5]、[6], and the Plancherel theorem on Cc^2(SL(2,R) ) is also obtained as an application. 相似文献
7.
AN ASYMPTOTIC ORDER OF FOURIER TRANSFORM ON SL(2,R) 总被引:1,自引:0,他引:1
In this paper, a better asymptotic order of Fourier transform on SL(2,R) is obtained by using classical analysis and Lie analysis comparing with that of [5],[6] ,and the Plancherel theorem on C2i(SL(2,R)) is also obtained as an application. 相似文献
8.
本文研究最坏框架和平均框架下区间[1,1]上带Jocobi权(1 x)α(1+x)β,α,β1/2的函数逼近问题.在最坏框架下,本文得到加权Sobolev空间BWr p,α,β在Lq,α,β(1 q∞)空间尺度下的Kolmogorov n-宽度和线性n-宽度的渐近最优阶,其中Lq,α,β(1 q∞)表示区间[1,1]上带Jacobi权的加权Lq空间.在平均框架下,本文研究具有Gauss测度的加权Sobolev空间Wr2,α,β被多项式子空间和Fourier部分和算子在Lq,α,β(1 q∞)空间尺度下的最佳逼近问题,得到平均误差估计的渐近阶.我们发现,在平均框架下,多项式子空间和Fourier部分和算子在Lq,α,β(1 q2+22 max{α,β}+1)空间尺度下是渐近最优的线性子空间和渐近最优的线性算子. 相似文献
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设Bn表示所有的n阶布尔矩阵的集合,R(A)表示A∈Bn的行空间,|R(A)|表示R(A)的基数.设m,n为正整数,本文证明了(1)Vm∈[1,46],[1,78],分别存在A∈B7,A∈B8,使得|R(A)|=m.(1)当n≥9为奇数时,则V m∈[1.2^(n 3)/2 2^(n 1)/2 … 2^3].存在A∈Bm,使得|R(A)|=m. 相似文献
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本文给出了C-代数上的Fourier变换,从而推广了经典数论上Fourier变换和任意有限Abel群的Fourier变换.进一步应用这个Fourier变换,给出了C-代数上的Vinogradov不等式. 相似文献
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在局部紧可分群的一般理论中,分解正则表示以及获得反演公式(或 Plan-cherel定理的明确表示)是调和分析的基本目标之一.SL(2, )是最简单的非交换局部紧么模半单Lie群.Harish-Chandra在 C∞c(SL(2, ))上获得了反演公式,Xiao和heng在文[1]中证明了C3c(SL(2, )上的反演公式.在文[2]中Zheng引入了Lie群G上函数的广义微分(A导数)概念.在本文中,我们利用文[2]中的微分概念来研究SL(2, )上可微函数的Fourier变换的阶,并获得了SL(2, )上速降函数的反演公式. 相似文献
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Semyon Yakubovich 《Comptes Rendus Mathematique》2011,349(11-12):633-636
By using structural and asymptotic properties of the Kontorovich–Lebedev transform associated with Minkowski?s question mark function, we give an affirmative answer to the question posed by R. Salem (Trans. Amer. Math. Soc. 53 (3) (1943) 439) whether its Fourier–Stieltjes transform vanishes at infinity. 相似文献
13.
Basic properties of wavelets 总被引:7,自引:0,他引:7
The Wutam Consortium 《Journal of Fourier Analysis and Applications》1998,4(4-5):575-594
A wavelet multiplier is a function whose product with the Fourier transform of a wavelet is the Fourier transform of a wavelet.
We characterize the wavelet multipliers, as well as the scaling function multipliers and low pass filter multipliers. We then
prove that if the set of all wavelet multipliers acts on the set of all MRA wavelets, the orbits are the sets of all MRA wavelets
whose Fourier transforms have equal absolute values, and these are also equal to the sets, of all MRA wavelets with the corresponding
scaling functions having the same absolute values of their Fourier transforms. As an application of these techniques, we prove
that the set of MRA wavelets is arcwise connected in L2(R).
Dedicated to Eugene Fabes
The Wutam Consortium 相似文献
14.
该文借助于犛犔(2,犚)上李代数及其万有包络代数讨论了犛犔(2,犚)上函数的Fourier变换在无穷远处下降的阶与函数的光滑性的关系,我们得到的结论较[6]中的结论好,并由此得到犆2犮(犌)中的Plancherel定理. 相似文献
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我们研究了由仅有实零点的代数多项式导出的微分算子确定的广义Sobolev类利用指数型整函数作为逼近工具的最佳限制逼近问题.利用Fourier变换和周期化等方法,得到在L_2(R)范数下的广义Sobolev光滑函数类的相对平均宽度和最佳限制逼近的精确常数,以及当0是这个代数多项式的一个至多2重的零点时,得到最佳限制逼近在L_1(R)范数和一致范数下的广义Sobolev类的精确到阶的结果. 相似文献
16.
本文研究了群在von Neumann代数上作用的自由性和遍历性问题.利用投影和群SL2(R)的Iwasawa分解,得到了可数离散群在交换von Neumann代数上作用的自由性的等价刻画,证明了SL2(R)在上半平面H上有理作用导出的SL2(R)在极大交换von Neumann代数A={Mf:f∈L2(H,dxdy/y2)}上的作用α是遍历的,但不是自由的. 相似文献
17.
The fast Fourier transform and the numerical solution of one-dimensional boundary integral equations
Summary Here we present a fully discretized projection method with Fourier series which is based on a modification of the fast Fourier transform. The method is applied to systems of integro-differential equations with the Cauchy kernel, boundary integral equations from the boundary element method and, more generally, to certain elliptic pseudodifferential equations on closed smooth curves. We use Gaussian quadratures on families of equidistant partitions combined with the fast Fourier transform. This yields an extremely accurate and fast numerical scheme. We present complete asymptotic error estimates including the quadrature errors. These are quasioptimal and of exponential order for analytic data. Numerical experiments for a scattering problem, the clamped plate and plane estatostatics confirm the theoretical convergence rates and show high accuracy. 相似文献
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