#LyX 1.3 created this file. For more info see http://www.lyx.org/
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\language english
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\graphics default
\paperfontsize default
\spacing single 
\papersize Default
\paperpackage a4
\use_geometry 0
\use_amsmath 0
\use_natbib 0
\use_numerical_citations 0
\paperorientation portrait
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\defskip medskip
\quotes_language english
\quotes_times 2
\papercolumns 1
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\layout Title

How to enter a matrix
\layout List
\labelwidthstring 00.00.0000

Ctrl-n Create new document
\layout List
\labelwidthstring 00.00.0000

Ctrl-M Insert math inset in display mode
\layout List
\labelwidthstring 00.00.0000

Meta-m\SpecialChar ~
[ Insert 
\begin_inset Formula $\left[\right]$
\end_inset 

 
\layout List
\labelwidthstring 00.00.0000

Math\SpecialChar ~
panel: Insert matrix, 3 rows, 3 columns
\layout Standard

Now just use the cursor to navigate around the entries in the matrix.
 Here's how it will look: (To create the fractions, use Meta-m\SpecialChar ~
f)
\layout Standard


\begin_inset Formula \[
\left[\begin{array}{ccc}
1 & \frac{1}{3} & \frac{1}{2}\\
3 & 1 & 3\\
2 & \frac{1}{3} & 1\end{array}\right]\]

\end_inset 


\the_end