## 每週問題 June 27, 2016

Let $A$ be an $n\times n$ matrix. If $A\mathbf{x}=\mathbf{0}$ has nonzero solutions, is it possible that $A^T\mathbf{x}=\mathbf{b}$ has a unique solution for some vector $\mathbf{b}$?

This entry was posted in pow 線性方程與矩陣代數, 每週問題 and tagged . Bookmark the permalink.