[OS X TeX] Left Justified Symbol

[Martin Costabel]

Rose Charlie wrote:
[]
> Very slick, and it does *almost* exactly what I need ... what's lacking 
> is that it's not in the "equation" environment so no equation number is 
> generated. And, being the LaTeX amateur that I am, I don't know how to 
> produce that myself. I *will* try to figure it out, though.

If your equation is not numbered, you can simply use \leqno:

$$
    your equation
\leqno\blacktriangleright
$$

For numbered equations, the following does the trick

\def\triangleeq{%
   \let\theeq\theequation
   \def\theequation{\theeq
      \rlap{\hskip -\displaywidth\ $\blacktriangleright$}}}

\begin{equation}
\triangleeq
   your equation
\end{equation}

Just use the command \triangleeq inside the equation environment where 
you want the triangle. The triangle will be placed at the beginning of 
the line that has the equation number.


-- 
Martin