如下Latex代码编译会出错: \begin{eqnarray} a &=& b \\ [a] &=& [b] \\ \end{eqnarray} 原因是[a]被识别成了\\后跟的长度,于是报错,于是需要把[转义,写成{[}就好了。 The following Latex code won't compile: \begin{eqnarray} a &=& b \\ [a] &=& [b] \\ \end{eqnarray} and the reason is that [a] is recognized as the length parameter of \\. So [ should be escaped, if written as {[} there won't be error any more.
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