Several Existence Theorems for Positive Radial Solutions to a Semilinear Elliptic BVP

§ 1.Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｓｉｎｃｅｓｅｃｏｎｄｏｒｄｅｒｅｌｌｉｐｔｉｃｂｏｕｎｄａｒｙｖａｌｕｅｐｒｏｂｌｅｍｓｈａｖｅｗｉｄｅａｐｐｌｉｃａｔｉｏｎｓｉｎｐｈｙｓｉｃｓ ,ｔｈｅｓｔｕｄｙｏｆｐｏｓｉｔｉｖｅｒａｄｉａｌｓｏｌｕｔｉｏｎｓｆｏｒｔｈｅｓｅｍｉｌｉｎｅａｒｐｒｏｂｌｅｍ　 (Ｐ) Δｕ(Ｘ) +ｇ( |Ｘ|)ｆ(ｕ(Ｘ) ) =0 ,　Ｒ1<|Ｘ|<Ｒ2 ,ｕ(Ｘ) =0 ,　 |Ｘ|=Ｒ1ｏｒ |Ｘ|=Ｒ2(ｗｈｅｒｅＲ1>0 ,Ｘ∈Ｒｎ,ｎ≥ 2 )ｈａｓｂｅｅｎｍａｄｅｆｏｒｒｅｃｅｎｔ 2 0ｙｅａｒｓ ;ｓｅｅ [1— 5]ｆｏｒｒ…     

DIAGONALLY COMPENSATED REDUCTION AND MULTISPLITTING OF A SYMMETRIC POSITIVE DEFINITE MATRIX

1　ＩｎｔｒｏｄｕｃｔｉｏｎＬｅｔＡｂｅａｎｎ×ｎｓｙｍｍｅｔｒｉｃｐｏｓｉｔｉｖｅｄｅｆｉｎｉｔｅｍａｔｒｉｘ .ＷｅｃｏｎｓｉｄｅｒｔｈｅｉｔｅｒａｔｉｖｅｓｏｌｕｔｉｏｎｏｆａｌａｒｇｅｌｉｎｅａｒｓｙｓｔｅｍｏｆｅｑｕａｔｉｏｎｓＡｘ=ｂｂｙｔｈｅｐａｒａｌｌｅｌｍｕｌｔｉｓｐｌｉｔｔｉｎｇｍｅｔｈｏｄ .ＴｈｅｍｕｌｔｉｓｐｌｉｔｔｉｎｇｍｅｔｈｏｄｗａｓｉｎｔｒｏｄｕｃｅｄｂｙＯ’ＬｅａｒｙａｎｄＷｈｉｔｅ[9] ａｎｄｆｕｒｔｈｅｒｓｔｕｄｉｅｄｂｙｍａｎｙｏｔｈｅｒａｕｔｈｏｒｓ .Ｂｕｔｔ…     

关于K个复相关矩阵相等的检验

§ 1.Ｉｎｔｒｏｄｕｃｔｉｏｎ　ＷｅａｒｅｇｉｖｅｎｋｉｎｄｅｐｅｎｄｅｎｔＷｉｓｈａｒｔｄｅｎｓｉｔｉｅｓｏｆｔｈｅ (ｐ +ｑ)× (ｐ +ｑ)ｒａｎｄｏｍｓｙｍｍｅｔｒｉｃｐｏｓｉｔｉｖｅｄｅｆｉｎｉｔｅｍａｔｒｉｃｅｓＧ1,… ,Ｇｋｔｏｂｅｇ(Ｇｉ) =Ｋｅｘｐ -12 ｔｒＲ- 1ｉ Ｇｉ Ｇｉ12 (ｎｉ- ｑ-ｐ- 1) ,(1 )ｗｈｅｒｅｉ=1 ,… ,ｋ,ａｎｄＲｉｄｅｎｏｔｅｓｔｈｅｐｏｐｕｌａｔｉｏｎｃｏｒｒｅｌａｔｉｏｎｍａｔｒｉｘｏｆｔｈｅｉ ｔｈｐｏｐｕｌａｔｉｏｎａｎｄＫａｓａｇｅｎｅｒｉｃｌｅｔｔｅｒｄｅｎｏｔｅ…     

等式与界约束非线性优化信赖域算法的全局收敛

§ 1　ＩｎｔｒｏｄｕｃｔｉｏｎＣｏｎｓｉｄｅｒｔｈｅｆｏｌｌｏｗｉｎｇｎｏｎｌｉｎｅａｒｏｐｔｉｍｉｚａｔｉｏｎｐｒｏｂｌｅｍ :ｍｉｎｉｍｉｚｅｆ(ｘ)ｓｕｂｊｅｃｔｔｏＣ(ｘ) =0 ,　ａ≤ｘ≤ｂ ,( 1 .1 )ｗｈｅｒｅｆ(ｘ) :Ｒｎ→Ｒ ,Ｃ(ｘ) =(ｃ1(ｘ) ,ｃ2 (ｘ) ,...,ｃｍ(ｘ) ) Ｔ:Ｒｎ→Ｒｍ ａｒｅｔｗｉｃｅｃｏｎｔｉｎｕｏｕｓｌｙｄｉｆｆｅｒｅｎｔｉａｂｌｅ,ｍ≤ｎ ,ａ ,ｂ∈Ｒｎ.Ｔｒｕｓｔｒｅｇｉｏｎａｌｇｏｒｉｔｈｍｓａｒｅｖｅｒｙｅｆｆｅｃｔｉｖｅｆｏｒｓｏｌｖｉｎｇｎｏｎｌｉｎｅａｒｏｐｔｉｍｉ…     

Additive Adjugate Preservers on the Matrices over Fields

§１．ＩｎｔｒｏｄｕｃｔｉｏｎＳｕｐｐｏｓｅｔｈａｔＦｉｓａｆｉｅｌｄａｎｄＦ＊ｉｔｓｍｕｌｔｉｐｌｉｃａｔｉｖｅｇｒｏｕｐ．ＬｅｔＭｎ（Ｆ）ａｎｄＳｎ（Ｆ）ｂｅｔｈｅｓｐａｃｅｏｆａｌｎ×ｎｍａｔｒｉｃｅｓａｎｄａｌｎ×ｎｓｙｍｍｅｔｒｉｃｍａｔｒ...     

Hardy－Littlewood Theorems in Mixed Norm Spaces on Bounded Symmetric Domain of C~n

Ｈａｒｄｙ－ＬｉｔｔｌｅｗｏｏｄＴｈｅｏｒｅｍｓｉｎＭｉｘｅｄＮｏｒｍＳｐａｃｅｓｏｎＢｏｕｎｄｅｄＳｙｍｍｅｔｒｉｃＤｏｍａｉｎｏｆＣ~ｎ￥（乌兰哈斯）ＷｕｌａｎＨａｓｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＩｎｎｅｒＭｏｎｇｏｌｉａＮ?..     

The Minimal Solutions of Boolean Matrix-equation A~k=J

ＬｅｔＢ ={0 ,1 }ｂｅｔｈｅｕｓｕａｌｂｉｎａｒｙＢｏｏｌｅａｎａｌｇｅｂｒａ .ＴｈｅｍａｔｒｉｃｅｓｏｖｅｒＢａｒｅｃａｌｌｅｄＢｏｏｌｅａｎｍａｔｒｉｃｅｓ.Ａｎｎ×ｎＢｏｏｌｅａｎｍａｔｒｉｘＡｉｓｃａｌｌｅｄａｐｒｉｍｉｔｉｖｅｍａｔｒｉｘｉｆｔｈｅｒｅｅｘｉｓｔｓａｐｏｓｉｔｉｖｅｉｎｔｅｇｅｒｋｓｕｃｈｔｈａｔＡｋ=Ｊ (ｗｈｅｒｅＪｉｓｔｈｅｕｎｉｖｅｒｓａｌｍａｔｒｉｘ) .ＴｈｅｌｅａｓｔｓｕｃｈｋｉｓｃａｌｌｅｄｔｈｅｅｘｐｏｎｅｎｔｏｆＡ ,ｄｅｎｏｔｅｄｂｙγ(Ａ) .　Ｉｎ ｐｒｏｊ…     

关于积流形的P－形式上的Laplace算子谱

本文讨论了积流形的Ｐ－形式上Ｌａｐｌａｃｅ算子谱的唯一性问题，在紧Ｋａｃｈｌｅｒ流形乘积和紧Ｓａｓａｋｉ流形乘积的两类积流形中，ＣＰ^ｎ×ＣＰ^ｎ和Ｓ^２ｎ＋１（１）×Ｓ^２ｎ＋１（１）是Ｐ－形式上Ｌａｐｌａｃｃｅ算子谱特征。     

Lagrange Interpolation on a Sphere

§ 1.Ｉｎｔｒｏｄｕｃｔｉｏｎ　ＬｅｔｎｂｅａｎｏｎｎｅｇａｔｉｖｅｉｎｔｅｇｅｒａｎｄＳ ={(ｘ ,ｙ ,ｚ)∈Ｒ3 |ｘ2 + ｙ2 +ｚ2 =1 }ｂｅｔｈｅｕｎｉｔｓｐｈｅｒｅｉｎＲ3 .Ｐ( 2 )ｎ ａｎｄＰ( 3 )ｎ ｄｅｎｏｔｅｔｈｅｓｐａｃｅｏｆａｌｌｂｉｖａｒｉａｔｅｐｏｌｙｎｏｍｉａｌｓｏｆｔｏｔａｌｄｅｇｒｅｅ≤ｎａｎｄｔｈｅｓｐａｃｅｏｆａｌｌｔｒｉｖａｒｉａｔｅｐｏｌｙｎｏｍｉａｌｓｏｆｔｏｔａｌｄｅｇｒｅｅ≤ｎｒｅｓｐｅｃｔｉｖｅｌｙ ,ｉ.ｅ .Ｐ( 2 )ｎ =∑0≤ｉ+ｊ≤ｎａｉｊｘｉｙｊ｜ａｉｊ ∈Ｒ ,Ｐ( 3 …     

Some of Commutators on Spaces of Homogeneous Type

§ 1.Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｌｅｔａｂｅａｍｅａｓｕｒａｂｌｅｆｕｎｃｔｉｏｎ ,ｂｅａ φ∈Ｓ(Ｒ)ｎｏｎｎｅｇａｔｉｖｅｆｕｎｃｔｉｏｎ ,ａｎｄ 0 <ｒ <∞ .Ｄｅｆｉｎｅｃｏｍｍｕｔａｔｏｒｓａｓｆｏｌｌｏｗｓ :Ｃｒａ( ｆ) (ｘ) =ｓｕｐｘ∈Ｑ1｜Ｑ｜∫Ｑ｜ａ(ｘ) -ａ( ｙ) ｜ｒ｜ｆ( ｙ) ｜ｄｙ ,( 1 .1 )ａｎｄΦｒａ( ｆ) (ｘ) =ｓｕｐε>0∫Ｒｎ｜ａ(ｘ) -ａ( ｙ) ｜ｒφε( ｜ｘ- ｙ｜)｜ｆ( ｙ) ｜ｄｙ ,( 1 .2 )ｗｈｅｒｅＱｄｅｎｏｔｅｓａｃｕｂｅａｎｄφε(ｔ) =1εｎφ ｔε .Ｔｈｅｓｅｔｗｏｏｐｅｒａｔ…     

On positive definite solution of a nonlinear matrix equation

In this paper, some necessary and sufficient conditions for the existence of the positive definite solutions for the matrix equation X + A^*X^?αA = Q with α ∈ (0, ∞) are given. Iterative methods to obtain the positive definite solutions are established and the rates of convergence of the considered methods are obtained. Copyright © 2006 John Wiley & Sons, Ltd.     

矩阵方程X+A*X-qA=Q(q≥1)的Hermite正定解

In this paper,Hermitian positive definite solutions of the nonlinear matrix equation X + A*X-qA = Q (q ≥ 1) are studied.Some new necessary and sufficient conditions for the existence of solutions are obtained.Two iterative methods are presented to compute the smallest and the quasi largest positive definite solutions,and the convergence analysis is also given.The theoretical results are illustrated by numerical examples.     

矩阵方程$X A^*X^{-q}A=Q~(q\geq 1)$的Hermite正定解

In this paper, Hermitian positive definite solutions of the nonlinear matrix equation X ＋ A^＊X^-qA = Q （q≥1） are studied. Some new necessary and sufficient conditions for the existence of solutions are obtained. Two iterative methods are presented to compute the smallest and the quasi largest positive definite solutions, and the convergence analysis is also given. The theoretical results are illustrated by numerical examples.     

关于非线性矩阵方程$X^s-A^*X^{-t}A=Q$的Hermitian正定解及其扰动估计

In this paper, the Hermitian positive definite solutions of the nonlinear matrix equation X^s - A^＊X^-tA = Q are studied, where Q is a Hermitian positive definite matrix, s and t are positive integers. The existence of a Hermitian positive definite solution is proved. A sufficient condition for the equation to have a unique Hermitian positive definite solution is given. Some estimates of the Hermitian positive definite solutions are obtained. Moreover, two perturbation bounds for the Hermitian positive definite solutions are derived and the results are illustrated by some numerical examples.     

矩阵方程AX=A+X有正定解和幂零解的充要条件

给出了矩阵方程AX=A+X有解、实对称解、正定解和幂零解的充要条件.     

矩阵方程aX2+bX+cE=O的正定解和实对称解

给出了矩阵方程aX2+bX+cE=O,a,b,c∈R,a≠0有正定解,实对称解的充分必要条件及解的一般形式.     

矩阵方程X+A~*X~(-n)A=P的Hermite正定解及其扰动分析

考虑非线性矩阵方程X A~*X~(-n)A=P,其中A是m阶非奇异复矩阵,P是m阶Hermite正定矩阵.本文利用不动点理论讨论了该方程Hermite正定解的存在性及包含区间,给出了极大解的性质及求极大,极小解的迭代算法.研究了极大解的扰动问题,利用微分等方法获得了两个新的一阶扰动界,并给出数值例子对所得结果进行了比较说明.     

The Constrained Solutions of Two Matrix Equations

We study the symmetric positive semidefinite solution of the matrix equation AX ₁ A ^T + BX ₂ B ^T = C, where A is a given real m×n matrix, B is a given real m×p matrix, and C is a given real m×m matric, with m, n, p positive integers; and the bisymmetric positive semidefinite solution of the matrix equation D ^T XD = C, where D is a given real n×m matrix, C is a given real m×m matrix, with m, n positive integers. By making use of the generalized singular value decomposition, we derive general analytic formulae, and present necessary and sufficient conditions for guaranteeing the existence of these solutions. Received December 17, 1999, Revised January 10, 2001, Accepted March 5, 2001     

一类非线性算子方程的正算子解的研究

研究了算子方程X^(-1)+A(-1)+A⁺X+X^tA=Q,的正算子解问题,给出了此类非线性算子方程正算子解的范围以及正算子解存在的一些充分必要条件,并用迭代的方法得到了方程的正算子解.     

关于正定矩阵的几个问题

本文推广了文［１］的主要定理，给出了用低阶矩阵判定高阶矩阵正定的判定定理，同时给出了矩阵方程ＡＸ＝Ｂ的反问题在正定矩阵类中解存在的充要条件及解的一般形式．