arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.12290math.OC
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关于完全正矩阵的CP分解的个数

On the number of CP factorizations of a completely positive matrix

Naomi Shaked-Monderer

摘要:

一个方阵$A$是完全正的,如果$A=BB^T$,其中$B$是一个(不一定是方阵)非负矩阵。一般来说,一个完全正的矩阵可以有许多甚至无穷多个这样的CP分解。但在某些情况下,存在唯一的CP分解。证明了图为三角形自由的完全正矩阵有唯一CP分解的一个简单的充要条件。这意味着在$n\times n$完全正矩阵的锥$\mathcal{CP}_n$的边界上的某些其它矩阵的CP分解的唯一性。我们还描述了包含完全正的$A$的$\mathcal{CP}_n$的极小面。如果$A$有唯一的CP分解,则该面是多面体。

英文摘要:

A square matrix $A$ is completely positive if $A=BB^T$, where $B$ is a (not necessarily square) nonnegative matrix. In general, a completely positive matrix may have many, even infinitely many, such CP factorizations. But in some cases a unique CP factorization exists. We prove a simple necessary and sufficient condition for a completely positive matrix whose graph is triangle free to have a unique CP factorization. This implies uniqueness of the CP factorization for some other matrices on the boundary of the cone $\mathcal{CP}_n$ of $n\times n$ completely positive matrices. We also describe the minimal face of $\mathcal{CP}_n$ containing a completely positive $A$. If $A$ has a unique CP factorization, this face is polyhedral.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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