LaTeX中大括号分支公式的书写

LaTeX中大括号分支公式的书写:用cases不会换行,用array可以

	\begin{equation}
	\label{eq:alpha}
\hat{F}_{h}^{i}(x,y) =\left\{
           \begin{array}{lcl}
    \quad 0,\quad   &if \quad |F_{h}^{i}(x,y)| < \sigma_{L} \\
    F_{h}^{i}(x,y),\quad  &othersize 
           \end{array},(1 \leq i\leq 3L)
        \right.
	\end{equation}
注意:对齐符号&后面不能出现单个未配对的括号{}


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