1 \documentclass[letterpaper]{article}
   2 \newcommand{\half}{\frac{1}{2}}
   3 
   4 \usepackage[latin1]{inputenc}
   5 \usepackage{calc}
   6 \usepackage{setspace}
   7 \usepackage{graphicx}
   8 \usepackage{multicol}
   9 \usepackage[normalem]{ulem}
  10 \usepackage{amsmath}
  11 %% Please set your language here
  12 \usepackage[english]{babel}
  13 \usepackage{color}
  14 \usepackage{mathrsfs}
  15 \usepackage[pdftex,bookmarks=true,bookmarksnumbered=true]{hyperref}
  16 
  17 \begin{document}
  18 \tableofcontents
  19 \section{section1}
  20 \subsection{subsection 1.1}
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  44 \section{section2}
  45 fgfdg
  46 \subsection{subsection\&2.1}
  47 fdgsdfg
  48 \end{document}