We consider maps on positive definite cones of von Neumann algebras preserving unitarily invariant norms of the spectral......

设A是m×n且秩为r的复矩阵，存在m×n次酉矩阵Q和n×n半正定矩阵H使得A=QH。此分解称为A的广义板分解。本文给出了在任......

Ky Fan maximum principle is a well-known observation about traces of certain hermitian matrices. In this note, we derive......

Given a symmetric matrix X, we consider the problem of finding a low-rank positive approximant of X. That is, a symmetri......

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