# Using binary operator in a sentence

\documentclass{article}
\usepackage{graphicx}

\begin{document}

\title{GROUP THEORY}

\maketitle

\section{Algebraic System}
It defines on binary operator \star  over a set A such that A \star A \rightarrow B

If the operator results in the same set that it operates upon, then the algebraic system is called "CLOSED"

Eg:
\begin{enumerate}
\item Set of integers is closed under +,-,\star\ operator.\
\item Set of integers is not closed under / operator.\
\end{enumerate}

\end{document}


i want

Group Theory

Algebraic System: It defines on binary operator * over a set A such that A * A --> B

Eg 1. set of integers +,-,* 2.set of integers /

(i want to replace * with star operator \star)

• Hi and welcome to TeX.SX! Well, how can we know what do you want? ;) Please construct a Minimal (non-)Working Example and possibly state exactly what is the desired output you try to achieve. – yo' Nov 1 '13 at 14:01
The commands you like to use are only valid in math-mode. i.e. between two $ signs: \documentclass{article} \usepackage{csquotes}% will help you to get real quotes ;-) \MakeOuterQuote{"} \begin{document} \title{GROUP THEORY} \maketitle \section{Algebraic System} It defines on binary operator$\star$over a set$A$such that$A \star A \rightarrow B$If the operator results in the same set that it operates upon, then the algebraic system is called "CLOSED" Eg: \begin{enumerate} \item Set of integers is closed under$+$,$-$,$\star$operator. \item Set of integers is not closed under$/$operator. \end{enumerate} \end{document}  In LateX you should declare everything that is math as such. That means that you use $…\$ or $$…$$ for inline and $…$ the {equation} environment (or one of the many other math environments) for display math.
BTW: "CLOSED" won’t give you the right quotes. If you load csquotes and define " as quotation markers with \MakeQuterQuote you’ll get the right symbols in your PDF …