Transpose of Row Matrix is Column Matrix

Theorem
Let $\mathbf x = \left[{x}\right]_{1 n} = \begin{bmatrix}x_1 & x_2 & \cdots & x_n\end{bmatrix}$ be a row matrix.

Then $\mathbf x^\intercal$, the transpose of $\mathbf x$, is a column matrix:


 * $\begin{bmatrix}x_1 & x_2 & \cdots & x_n\end{bmatrix}^\intercal = \begin{bmatrix}x_1 \\ x_2 \\ \vdots \\ x_n\end{bmatrix}$

Proof
Self-evident.