## Differential Equations and Linear Algebra (4th Edition)

Column 2-vectors: $\begin{bmatrix} 1 \\ 3 \end{bmatrix}$ and $\begin{bmatrix} -1 \\ 5 \end{bmatrix}$ Row 2-vectors: $\begin{bmatrix} 1 & -1 \end{bmatrix}$ and $\begin{bmatrix} 3 & 5 \end{bmatrix}$
Column vectors With $j=1$ $\begin{bmatrix} a_{11} \\ a_{21} \end{bmatrix}=\begin{bmatrix} 1 \\ 3 \end{bmatrix}$ With $j=2$ $\begin{bmatrix} a_{12} \\ a_{22} \end{bmatrix}=\begin{bmatrix} -1 \\ 5 \end{bmatrix}$ Row vectors With $i=1$ $\begin{bmatrix} a_{11} & a_{12} \end{bmatrix}=\begin{bmatrix} 1 & -1 \end{bmatrix}$ With $i=2$ $\begin{bmatrix} a_{21} & a_{22} \end{bmatrix}=\begin{bmatrix} 3 & 5 \end{bmatrix}$