On 08/20/2009 08:57 AM, Sam Liddicott wrote:
In a display-equation environment I can't get the cases environment to
work properly, unless I just use the first column.

I get the error:

Misplaced alignment tab character&.

I can't figure out why you would want to use a tab mark
here. If you just want an ampersand, the remedy is
simple: Just type `I\&' now. But if some right brace
up above has ended a previous alignment prematurely,
you're probably due for more error messages, and you
might try typing `S' now just to see what is salvageable.

Furthermore, if I just use the left column, then it is displayed all on
one line.

Has someone got this to do anything useful?

I've just done a simple one, attached. You want to attach what you are trying to do?


#LyX 1.6.4svn created this file. For more info see http://www.lyx.org/
\lyxformat 345
\textclass paper
\use_default_options false
\language english
\inputencoding auto
\font_roman default
\font_sans default
\font_typewriter default
\font_default_family default
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100

\graphics default
\paperfontsize 11
\spacing onehalf
\use_hyperref false
\papersize letterpaper
\use_geometry true
\use_amsmath 1
\use_esint 0
\cite_engine natbib_authoryear
\use_bibtopic false
\paperorientation portrait
\leftmargin 1in
\topmargin 1in
\rightmargin 1in
\bottommargin 1in
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\defskip smallskip
\quotes_language english
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\author "" 
\author "" 


\begin_layout Standard
\begin_inset Formula \[
a & b\\
d & c\end{cases}\]




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