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1.
本文利用高维M"obius变换的Clifford矩阵表示,讨论了高维M"obius变换的正则性,证明了三维抛物M"obius变换一定是正则的,得到了三维非抛物M"obius变换是正则的一条充要条件;同时举例说明上述充要条件在 SL(2,n) (n=2k,k 2)中不成立.  相似文献   

2.
本文利用高维Mbius变换的 Clifford矩阵表示,讨论了高维 Mbius变换的正则性;证明了三维抛物Mbius变换一定是正则的,得到了三维非抛物Mbius变换是正则的一条充要条件;同时举例说明上述充要条件在SL(2, n)(n=2k,k≥2)中不成立.  相似文献   

3.
王仙桃  蒋月评 《数学学报》2000,43(2):309-316
本文利用高维Mbius变换的 Clifford矩阵表示,讨论了高维 Mbius变换的正则性;证明了三维抛物Mbius变换一定是正则的,得到了三维非抛物Mbius变换是正则的一条充要条件;同时举例说明上述充要条件在SL(2, n)(n=2k,k≥2)中不成立.  相似文献   

4.
首先,给出了R3中平面和球面方程的超复形式,接着提出了R3中平面和球面方程的超复形式,接着提出了R3中关于平面和球面对称点的概念,并给出了关于平面和球面对称点所满足的等价方程.我们考虑了超复空间Cl_3中的一些特殊的Mbius变换,并给出了其一些性质,比如:保持球面或平面不变性,保持关于平面和球面对称性不变性,保持交比不变性等.文中给出了正则函数和Mbius变换的关系.其次,证明了R3中关于平面和球面对称点的概念,并给出了关于平面和球面对称点所满足的等价方程.我们考虑了超复空间Cl_3中的一些特殊的Mbius变换,并给出了其一些性质,比如:保持球面或平面不变性,保持关于平面和球面对称性不变性,保持交比不变性等.文中给出了正则函数和Mbius变换的关系.其次,证明了R3中球内正则函数的推广的Cauchy定理和Cauchy积分公式.借助于上述正则函数的Cauchy积分公式和其对称点的积分表示,给出了正则函数的Poisson积分表示.最后,在Mbius变换的性质基础上,给出了Mbius变换下曲面积分的变量替换公式.  相似文献   

5.
关于Mobius反转公式的一个推广   总被引:1,自引:0,他引:1  
本文研究了著名的M(o)bius变换,并将其反转公式进行了推广和延伸.  相似文献   

6.
李珂陈化 《数学学报》2008,51(6):1089-109
设X=(X_1,...,X_m)是一组无穷阶退化向量场,Δ_X=Σ_(j=1)~m X_j~*X_j,其中X_j~*是X_j的形式自伴算子.运用不动点理论得到抛物方程u_t=Δ_Xu+u log|u|解的存在性.  相似文献   

7.
8.
离散Fourier变换(DFT)在数字信号处理等许多领域中占有重要地位.近年来,出现一种优于FFT的算术Fourier变换来计算DFT.在广义Mobius变换的基础上,本文采用了一种改进的AFT来计算DFT,这种方法可以直接提取DFT的系数,且用数论的方法阐明了这一过程,并展开了进一步的讨论.这也代表了数论方法应用在计算数学领域的一个新的发展方向.  相似文献   

9.
离散Fourier变换(DFT)在数字信号处理等许多领域中占有重要地位.近年来,出现一种优于FFT的算术Fourier变换来计算DFT.在广义M(o)bius变换的基础上,本文采用了一种改进的AFT来计算DFT,这种方法可以直接提取DFT的系数,且用数论的方法阐明了这一过程,并展开了进一步的讨论.这也代表了数论方法应用在计算数学领域的一个新的发展方向.  相似文献   

10.
本文利用高维保向Mobius变换的Clifford矩阵表示,对三维广义椭圆Mobius群,椭圆Mobius群及运动Mobius群进行了讨论,得到了它们各自的特征。  相似文献   

11.
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Around the central theme of \"square root\" of the Laplace operator it is shown that the classical Riesz potentials of the first and of the second kind allow for an explicit expression of so-called Hilbert-Dirac convolution operators involving natural and complex powers of the Dirac operator.  相似文献   

12.
    
This paper gives the exact bound of the continued fraction expansion of when has bounded partial quotients and is a Möbius transformation where all entries are integers.

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13.
14.
The simultaneous null solutions of the two complex Hermitian Dirac operators are focused on in Hermitian Clifford analysis, where the Hermitian Cauchy integral was constructed and will play an important role in the framework of circulant (2×2) matrix functions. Under this setting we will present the half Dirichlet problem for circulant (2×2) matrix functions on the unit ball of even dimensional Euclidean space. We will give the unique solution to it merely by using the Hermitian Cauchy transformation, get the solution to the Dirichlet problem on the unit ball for circulant (2×2) matrix functions and the solution to the classical Dirichlet problem as the special case, derive a decomposition of the Poisson kernel for matrix Laplace operator, and further obtain the decomposition theorems of solution space to the Dirichlet problem for circulant (2×2) matrix functions.  相似文献   

15.
In this paper the white-noise paraxial wave model is considered. This model describes for instance the propagation of laser beams in the atmosphere in some typical scaling regimes. The closed-form equations for the second- and fourth-order moments of the field are solved in two particular situations. The first situation corresponds to a random medium with a transverse correlation radius smaller than the beam radius. This is the spot-dancing regime: the beam shape spreads out as in a homogeneous medium and its center is randomly shifted according to a Gaussian process whose variance grows like the third power of the propagation distance. The second situation corresponds to a plane-wave initial condition, a small amplitude for the medium fluctuations, and a large propagation distance. This is the scintillation regime: the normalized variance of the intensity converges to one exponentially with the propagation distance, corresponding to strong intensity fluctuations and in agreement with the conjecture that the statistics of the field becomes complex Gaussian.  相似文献   

16.
Clifford分析中奇异积分的Poincaré-Bertrand置换公式   总被引:3,自引:0,他引:3  
借助于多元复分析的思想,本文证明了Cliford分析中奇异积分的Poincaré-Bertrand置换公式.  相似文献   

17.
首先,在实Clifford代数空间Cl_n+1,0(R)中给出了与Clifford Mbius变换相关的一些定理.其次,证明了hypergenic函数与Clifford Mobius变换的复合可以得到一个加权的hypergenic函数.  相似文献   

18.
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In an inner-product space, an invertible vector generates a reflection with respect to a hyperplane, and the Clifford product of several invertible vectors, called a versor in Clifford algebra, generates the composition of the corresponding reflections, which is an orthogonal transformation. Given a versor in a Clifford algebra, finding another sequence of invertible vectors of strictly shorter length but whose Clifford product still equals the input versor, is called versor compression. Geometrically, versor compression is equivalent to decomposing an orthogonal transformation into a shorter sequence of reflections. This paper proposes a simple algorithm of compressing versors of symbolic form in Clifford algebra. The algorithm is based on computing the intersections of lines with planes in the corresponding Grassmann-Cayley algebra, and is complete in the case of Euclidean or Minkowski inner-product space.  相似文献   

19.
    
Let be a quadratic polynomial over a splitting field , and be the set of zeros of . We define an associative and commutative binary relation on so that every Möbius transformation with fixed point set is of the form ``plus' for some . This permits an easy proof of Aitken acceleration as well as generalizations of known results concerning Newton's method, the secant method, Halley's method, and higher order methods. If is equipped with a norm, then we give necessary and sufficient conditions for the iterates of a Möbius transformation to converge (necessarily to one of its fixed points) in the norm topology. Finally, we show that if the fixed points of are distinct and the iterates of converge, then Newton's method converges with order 2, and higher order generalizations converge accordingly.

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