LaTeX公式大小
使用LaTeX的一个好处，就是对于数学公式的排版。对于大量公式的论文，有时需要调整文档中显示公式的大小。
LaTeX根据文本字体的大小，调整公式的大小。但也可以自己定义，用到的命令为 \DeclareMathSizes{ds}{ts}{ss}{sss} 。例如，下面一段代码加在文档"preamable"部分就可以实现对公式大小的修改：
% Size of the math equations
\DeclareMathSizes{10}{10}{7}{5}
\DeclareMathSizes{11}{11}{7.7}{5.5}
\DeclareMathSizes{12}{12}{8.4}{6}
\DeclareMathSizes{13}{13}{9.1}{6.5}
\DeclareMathSizes{14}{14}{9.8}{7}
上面，第一个大括号里是文档使用的字号。只有在这与文档中字号定义相同时，后面对于公式大小的定义才有效。后面三个大括号分别定义的是，普通公式字号、第一级上下标、第二级上下标的字号大小。
如果在一个使用12号字体的文档里，使用
\DeclareMathSizes{12}{20}{14}{10}
就可以得到，相对大的公式。但注意到，行间公式也相应放大。
参考：
http://www.andy-roberts.net/misc/latex/latextutorial10.html
http://www.tex.ac.uk/cgi-bin/texfaq2html?label=mathsize
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