## 2011-04-16

### latex 转义字符 | esapce characters in latex

\begin{eqnarray}  a &=& b \\  [a] &=& [b] \\\end{eqnarray}

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.