[texhax] Simultaneous Equations?

Fri Feb 20 10:18:39 CET 2004

Sorry All,

I sent this to Gavin but not to all:

Try eqnarray

\begin{eqnarray}

& \begin{bmatrix} 1&0&0&0 \end{bmatrix} (I-\beta \Delta )^T \Delta (I-\beta
\Delta) \begin{bmatrix}1\\0\\0\\0 \end{bmatrix}
(\phi(i)-\phi(j))^2+\nonumber \\

&\begin{bmatrix} 0&0&1&0 \end{bmatrix} (I-\beta \Delta )^T \Delta (I-\beta
\Delta) \begin{bmatrix}0\\0\\1\\0 \end{bmatrix}
(\phi(k)-\phi(l))^2+\nonumber \\

& 2 \begin{bmatrix} 1&0&0&0 \end{bmatrix} (I-\beta \Delta )^T \Delta
(I-\beta \Delta) \begin{bmatrix}0\\0\\1\\0 \end{bmatrix}\nonumber \\&
(\phi(i)-\phi(j))(\phi(k)-\phi(l))

\end{eqnarray}

put \nonumber at the end of each line if you don't want a number.

jim

> Hi Jim,
>
> How do I get a large { to sit to the left of the equations in your
> example though?
>
> Thanks,
> Gavin Baker

A bmatrix is a bracket:[
I think $\bigl \{ stuff \bigr \}$
and \Bigl \Bigr
and \BIGl \BIGr
give increasingly bigger left (l) and right (r) braces
They are math equations.

jim

----- Original Message -----
From: "Philip G. Ratcliffe" <philipratcliffe at tiscali.it>
To: "Gavin Baker" <gav at supercowpowers.org>; "TeXhax" <texhax at tug.org>
Sent: Wednesday, February 18, 2004 5:04 AM
Subject: RE: [texhax] Simultaneous Equations?

> > I'm having a big problem trying to display simultaneous equations.
> >
> > I want something like:
> >
> > $> > \left\{ > > \begin{array}{rclr} > > foo&=&bar\\ > > bar&=&foo > > \end{array} > > \right. > >$
> >
> > but with both equations numbered.
>
> It's a horrible bodge as it is, but you could work on it (needs
> \usepackage{amsmath}):
>
> \begin{align}
>   foo &= bar\\[-3.3ex]
>   \left\{ \vphantom{\frac00} \right. \hspace{1.7em} \nonumber\\[-3.3ex]
>   bar &= foo
> \end{align}
>
> Cordialmente,  Philip G. Ratcliffe
>
> _______________________________________________
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