Math & Science ⇒ Equation Numbering

[mppxtylr]

Hi,

I'm trying to make an equation and it's not numbering.

Code: Select all

\begin{equation}
\[ CONA = \left\{ \begin{array}{ll}
          1 & \mbox{if $IOPQ < IRTQ\cdot k$};\\
          0 & \mbox{otherwise}.
	\label{eq:fault}
\end{array} \right. \] 
\end{equation}

Is there a way to make this number?

Thank you

[localghost]

You should listen to the compiler and look at what it tells you in the log file. You are getting errors because nesting two math environment this way can't work. Furthermore there is a much smarter way to typeset a case differentiation by the amsmath package.

Code: Select all

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools}   % loads »amsmath«

\begin{document}
  \begin{equation}\label{eq:fault}
    \text{CONA}=
    \begin{cases}
      1 & \text{if IOPQ} < \text{IRTQ}\cdot k; \\
      0 & \text{otherwise.}
    \end{cases}
  \end{equation}
\end{document}

Thorsten