[Tugindia] Re: Help required

[David Kastrup]

"Manjunatha G." <manju at rri.res.in> writes:

> Hello!
> Pls help!
> 
> I need to provide a veticle line before and after the equation.
> The command I have used below, which produced just a left curly 
> bracket. Also, I need some space to provide between the each segment. 
> eg.  1 \cdot 2 (space) 2 \cdot 1 (space) 1.  What command should I use to 
> produce 
> these.         
> 
> \begin{eqnarray}
> S^2 = - \det \cases{1 \cdot 1  2 \cdot 1 3 \cdot 1 \cr
>                     1 \cdot 2  2 \cdot 2 3 \cdot 2 \cr
>                     1 \cdot 3  2 \cdot 3 3 \cdot 3}
> \end{eqnarray}

First of all, you should get yourself any introductory text about
LaTeX: eqnarray is not used in that way (you would need & characters
around the =, and, anyhow, it is pretty pointless for single
equations).

In general, I would recommend using amsmath.sty for any serious
typesetting of math, and it comes with instructions in amsldoc.dvi
(which can be read with

  texdoc amsldoc

on teTeX-similar systems).  In your case, probably something like
\begin{equation}
S^2 = - \left| \begin{array}{ccc}
                    1 \cdot 1 & 2 \cdot 2 & 3 \cdot 1\\
                    1 \cdot 2 & 2 \cdot 2 & 3 \cdot 2\\
                    1 \cdot 3 & 2 \cdot 3 & 3 \cdot 3
               \end{array} \right|
\end{equation}

sould be appropriate.


-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum
UKTUG FAQ: <URL:http://www.tex.ac.uk/cgi-bin/texfaq2html>