#This file was created by <larsbj> Fri Sep 12 18:42:50 1997
#LyX 0.11 (C) 1995-1997 Matthias Ettrich and the LyX Team
\lyxformat 2.15
\textclass article
\begin_preamble
% just a comment
% to see if it works
% as it should


\end_preamble
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\spacing single 
\papersize letterpaper
\paperpackage a4
\use_geometry 0
\paperorientation portrait
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\defskip medskip
\quotes_language english
\quotes_times 2
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\paperpagestyle plain

\layout Standard

The math editor allows you to insert delimiters.
 These are some silly examples:
\layout Standard


\begin_inset Formula 
\[
\left( \begin{array}{ccc}
\left\langle \psi _{o}|\psi _{o}\right\rangle  & \left[ 7a\right]  & \left\uparrow A\right\downarrow \\
x\left( x-2\right)  & \left\{ \oslash \right\}  & \left/ 2\right\backslash \\
\left| P_{o}\right\Vert  & \left\Updownarrow \frac{1}{2}\right\Downarrow  & \left\lfloor A\right\rfloor 
\end{array}\right) \]

\end_inset 


\layout Standard

Combining delimiters with a 
\begin_inset Formula \( 2\times 2 \)
\end_inset 

 matrix you can do things like this:
\layout Standard


\begin_inset Formula 
\[
f(x):=\left\{ \begin{array}{ll}
x^{2} & x\leq 1\\
2x+1 & x>1
\end{array}\right. \]

\end_inset 


\layout Standard
\cursor 79 
Also it's possible to insert wide accents like 
\shape italic 
widehat
\shape default 
 
\begin_inset Formula \( \widehat{AB} \)
\end_inset 

 and 
\shape italic 
widetilde 
\begin_inset Formula \( \widetilde{CD} \)
\end_inset 


\shape default 
; and decorations like 
\shape italic 
overbrace 
\begin_inset Formula \( \overbrace{m+n} \)
\end_inset 


\shape default 
,
\shape italic 
 overline 
\begin_inset Formula \( \overline{a-b} \)
\end_inset 


\shape default 
,
\shape italic 
 overleftarrow 
\begin_inset Formula \( \overleftarrow{AB} \)
\end_inset 


\shape default 
,
\shape italic 
 overrightarrow 
\begin_inset Formula \( \overrightarrow{CD} \)
\end_inset 


\shape default 
,
\shape italic 
 underbrace 
\begin_inset Formula \( \underbrace{a+b} \)
\end_inset 

 and underline 
\begin_inset Formula \( \underline{c-d} \)
\end_inset 


\shape default 
.
\the_end
