Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!crdgw1!betelgeuse!halvers
From: halvers@betelgeuse.crd.ge.com (Pete Halverson)
Newsgroups: comp.text.tex
Subject: Re: Equations in LaTeX question
Summary: use eqnarray or array
Message-ID: <18436@crdgw1.crd.ge.com>
Date: 11 Apr 91 12:31:59 GMT
References: <31808@usc>
Sender: news@crdgw1.crd.ge.com
Reply-To: halverson@crd.ge.com (Pete Halverson)
Organization: General Electric Corporate R&D Center
Lines: 31

In article <31808@usc> ajayshah@alhena.usc.edu (Ajay Shah) writes:
>
>I'd like to typeset equations like:
>
>    z = (x+y)^2
>      = x^2 + 2xy + y^2
>
>The \TeX book has a nice concept called \eqalign which lines up
>equations so the = comes vertically aligned.  It doesn't work in
>LaTeX.
>
>Any ideas on how it's done?

The simplest way is to use the eqnarray* environment, separating the LH,
the equals sign, and the RH with "&" and separating lines with "\\":

   \begin{eqnarray*}
   z & = & (x+y)^2 \\
     & = & x^2 + 2xy + y^2
   \end{eqnarray*}

If you need to do more interesting alignment, or embed these equations
within higher-level math constructs, you should look at the documentation
for the "array" environment, which is what eqnarray* is based on.


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Pete Halverson                        		    INET: halverson@crd.ge.com 
GE Corporate R&D Center	                      UUCP: uunet!crd.ge.com!halverson
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