[texhax] Equation Array Environment...

[William F. Adams]

On Aug 4, 2005, at 11:09 AM, Chris Bourke wrote:

> I find the eqnarray/eqnarray* environments too restrictive--one can 
> only
> have three columns formatted in {rcl}.  I've tried using the
> equationarray.sty file on ctan, but with no documentation, I don't 
> find it
> useful, and it doesn't seem to do exactly what I want:
>
> I'd like an environment like the eqnarray/eqnarray* environment, but 
> with
> 4 columns formatted in {rcll} in which the 4th column is always 
> typeset in
> either textrm or mathrm font.  The use of this forth column is for
> explanations (i.e. "by Lemma x.x" or "By associativity", etc).
>
> Is there anything out there that can do this, or can a more experienced
> texer hack something together real quick?

\usepackage{amsmath}

\begin{align} &c.

William

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