Hi Jim:
the ams alignment works pretty good for my case. I put "=" and "+" in the left box, other part of the equation in the right hand. thanks a lot for your suggestion!
lynette
On 1/18/11 5:54 PM, Jim Oldfield wrote:
From: xiaochu<xiao...@gmail.com>
     I used \eqnarray to input an equation with both  very long left hand side
and right hand side. to enter display mode first, then  Command+enter. there are
three boxes at each row. No matter how I adjusted the  position of the equation
in these three boxes. The result turns out to be quite  ugly. Can anyone help?
thanks a lot.

Is it a single equation that you want to break onto two lines?  If so, use the
AMS multline environment instead of eqnarray.  If not and I have misunderstood
your problem, you solution is still to use one of the other AMS environments;
even if you get eqnarray to produce roughly the result you want, it gets the
spacing slightly wrong.


To use multiline:
  1. create some math (inline, display, or whatever)
  2. right click on it and choose "AMS environment", and from that submenu 
choose
"AMS multline"
  3. type the left hand side of the equation you want to typeset (this line will
be left aligned)
  4. press ctrl+enter, which puts you onto a new line
  5. type the right hand side of the equation (this line will be left aligned)

If you repeat 4 and 5, so that you have more than two rows, then only the last
line will be right aligned and the ones in between will be centered, even though
LyX doesn't show them like that.

If the left and right hand sides aren't *too* long, this may not look right.
  Instead use an AMS align environment, putting everything on the right hand
side, and prefixing all lines except the first with \qquad.

Jim




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