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arXiv 1010.5564math.COmath.FA
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矩阵的$G-$分解及相关问题I

$G-$Decompositions of Matrices and Related Problems I

Rasul Ganikhodjaev, Farrukh Mukhamedov, Mansoor Saburov

摘要:

本文引入矩阵的$G-$分解的概念。本文的主要结果是对称矩阵$G-$在随机类(分别为:substochastic)矩阵当且仅当$A_m$属于集合${\mathbf{U}}^m$(resp. ${\mathbf{U}}_m$)。为了证明主要结果,我们研究了集合${\mathbf{U}}^m$,${\mathbf{U}}_m$的极值点和几何结构.注意,这样的调查,使研究Birkhoff的问题,二次$G-$双随机算子。

英文摘要:

In the present paper we introduce a notion of $G-$decompositions of matrices. Main result of the paper is that a symmetric matrix $A_m$ has a $G-$decomposition in the class of stochastic (resp. substochastic) matrices if and only if $A_m$ belongs to the set ${\mathbf{U}}^m$ (resp. ${\mathbf{U}}_m$). To prove the main result, we study extremal points and geometrical structures of the sets ${\mathbf{U}}^m$, ${\mathbf{U}}_m$. Note that such kind of investigations enables to study Birkhoff's problem for quadratic $G-$doubly stochastic operators.

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