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%TCIDATA{<META NAME="Title" CONTENT="Case Expressions">}
%TCIDATA{Created=Mon Aug 19 14:52:24 1996}
%TCIDATA{LastRevised=Thu Feb 13 20:10:31 1997}
%TCIDATA{Language=American English}
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\begin{document}


\section{Case Expressions}

A case expression is of this form:

\[
f\left( x\right) =\left\{ 
\begin{array}{lll}
0\text{ } & \text{if } & x<0 \\ 
1\text{ } & \text{if } & x\geq 0
\end{array}
\right. 
\]

The right side of the expression is a \hyperref{matrix}{}{}{Matrix.tex}
surrounded by brackets. The right bracket is an \hyperref{empty bracket}{}{}{%
Empty.tex}.

\subsubsection{$\blacktriangleright $\quad To enter a case expression}

\begin{enumerate}
\item  Enter the expression to the left of the =.

\item  Enter the =.

\item  Create a matrix.

\item  Enclose the matrix in brackets with an empty right bracket. The empty
bracket is shown in the Brackets dialog box as \FRAME{itbpF}{13.0625pt}{%
22.4375pt}{4pt}{}{}{empty.wmf}{\special{language "Scientific Word";type
"GRAPHIC";display "PICT";valid_file "F";width 13.0625pt;height
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20.3125pt;cropleft "0";croptop "1";cropright "1";cropbottom "0";filename
'empty.wmf';file-properties "XNPEU";}}.

\item  Enter the case expression in the matrix.
\end{enumerate}

\subsubsection{$\blacktriangleright $\quad To align the case expression}

\begin{itemize}
\item  Edit the \hyperref{properties}{}{}{Properties.tex} of the
matrix.\medskip 
\end{itemize}

\subsection{$\ $Related topics}

\begin{itemize}
\item  \hyperref{Aligning matrix columns}{}{}{Align_matrix_columns.tex}

\QTP{itemize}
\item  \hyperref{Matrices}{}{}{Matrix.tex}

\item  \hyperref{Editing a matrix}{}{}{Editing_matrix.tex}
\end{itemize}

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