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I am trying to compile from PdfLatex to Pdf but i keep getting this error. What should I do?

Undefined control sequence.
l.5 \section

Below is a part of my code

% file name : switch-models.tex 
%  input to HW-2-main.tex 
% 
% for compsci190-2013F
\section {FHN switch models} 



\begin{itemize}  
\item Review of the three switch models in lecture notes 
\item Suggestion : think of {\em infinitesimal changes} in time
  and the corresponding potential. 
\end{itemize} 

\vspace{1 cm} 


\subsection{Model (1)} 

Consider the basic model for a single switch. 
  • 2
    Welcome to TeX.SX! You need a \documentclass declaration at the start of your file, say \documentclass{article} and then \begin{document} before the text. You probably have them in HW-2-main.tex, which is the file which you should run LaTeX on. – egreg Oct 4 '13 at 0:12
  • Sorry, but please read any manual on LaTeX. – Reinstate Monica - M. Schröder Oct 4 '13 at 21:57
2

you have mutiple files, but main file must begin with \documentclass{style} e.g. \documentclass{article} , a MWE is presented below

\documentclass{article} % %

\begin{document}  % %
\section {FHN switch models} 



\begin{itemize}  
\item Review of the three switch models in lecture notes 
\item Suggestion : think of {\em infinitesimal changes} in time
  and the corresponding potential. 
\end{itemize} 

\vspace{1 cm} 


\subsection{Model (1)} 

Consider the basic model for a single switch. 
\end{document} % %

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