# よく使うLaTeXコマンド

$x^{-2}$ $x^{-2}$
$x_{12}$ $x\_{12}$
$\frac{1}{2}$ $\frac{1}{2}$
$y = 2x + 1 \tag{1}$ $y = 2x + 1 \tag{1}$
$\frac{\partial L}{\partial W}$ $\frac{\partial L}{\partial W}$
\begin{align} x + y = 3 \tag{1} \\\ 2x - y = 0 \tag{2} \end{align}
\begin{align} x + y = 3 \tag{1} \\\ 2x - y = 0 \tag{2} \end{align}
$$y = \begin{cases} x & (x > 0) \\\ 0 & (x \leqq 0) \end{cases}$$
$$y = \begin{cases} x & (x > 0) \\\ 0 & (x \leqq 0) \end{cases}$$
$$\sum\_{i=0}^{k} x\_{k}$$
$$\sum\_{i=0}^{k} x\_k$$
$$\begin{pmatrix} 1 & 2 \\\ 3 & 4 \end{pmatrix}$$
$$\begin{pmatrix} 1 & 2 \\\ 3 & 4 \end{pmatrix}$$