update chapter 3.2

Book/mt-book.tex

@@ -58,23 +58,23 @@
 \end{CJK}
 %公式字体设置为计算机现代罗马
 \AtBeginDocument{
-\SetSymbolFont{operators}   {normal}{OT1}{cmr} {m}{n}
-\SetSymbolFont{letters}     {normal}{OML}{cmm} {m}{it}
-\SetSymbolFont{symbols}     {normal}{OMS}{cmsy}{m}{n}
+\SetSymbolFont{operators}{normal}{OT1}{cmr}{m}{n}
+\SetSymbolFont{letters}{normal} {OML}{cmm}{m}{it}
+\SetSymbolFont{symbols}{normal}{OMS}{cmsy}{m}{n}
 \SetSymbolFont{largesymbols}{normal}{OMX}{cmex}{m}{n}
-\SetSymbolFont{operators}   {bold}  {OT1}{cmr} {bx}{n}
-\SetSymbolFont{letters}     {bold}  {OML}{cmm} {b}{it}
-\SetSymbolFont{symbols}     {bold}  {OMS}{cmsy}{b}{n}
-\SetSymbolFont{largesymbols}{bold}  {OMX}{cmex}{m}{n}
+\SetSymbolFont{operators}{bold}{OT1}{cmr}{bx}{n}
+\SetSymbolFont{letters}{bold}{OML}{cmm}{b}{it}
+\SetSymbolFont{symbols}{bold}{OMS}{cmsy}{b}{n}
+\SetSymbolFont{largesymbols}{bold}{OMX}{cmex}{m}{n}
 
 \SetMathAlphabet{\mathbf}{normal}{OT1}{cmr}{bx}{n}
 \SetMathAlphabet{\mathsf}{normal}{OT1}{cmss}{m}{n}
 \SetMathAlphabet{\mathit}{normal}{OT1}{cmr}{m}{it}
 \SetMathAlphabet{\mathtt}{normal}{OT1}{cmtt}{m}{n}
-\SetMathAlphabet{\mathbf}{bold}  {OT1}{cmr}{bx}{n}
-\SetMathAlphabet{\mathsf}{bold}  {OT1}{cmss}{bx}{n}
-\SetMathAlphabet{\mathit}{bold}  {OT1}{cmr}{bx}{it}
-\SetMathAlphabet{\mathtt}{bold}  {OT1}{cmtt}{m}{n}
+\SetMathAlphabet{\mathbf}{bold}{OT1}{cmr}{bx}{n}
+\SetMathAlphabet{\mathsf}{bold}{OT1}{cmss}{bx}{n}
+\SetMathAlphabet{\mathit}{bold}{OT1}{cmr}{bx}{it}
+\SetMathAlphabet{\mathtt}{bold}{OT1}{cmtt}{m}{n}
 }
 \renewcommand{\baselinestretch}{1.2}%设置行间距
 \begin{document}