~ \sim
Latex中较大的左右花括号:\left\{ ... \right\}
E.g.
\begin{equation}
I = \left\{ x: \frac{x_1-x_2}{x_1+x_2}>0 \right\}
\end{equation}
注意:
写作: \left\{... \right\}
不是: \left{ ... \right}
- \left\{
- \begin{array}{ccc}
- a=b+c & \qquad(24a) \\ \\
- a^2+b^2=c^2 & \qquad (24b)
- \end{array}
- \right.