I use

\def\zag#1#2{
  {{\hfill \left. {#1} \right|}
   \over
   {\left| {#2} \right. \hfill}
  }
}

on the axiom-wik.newsynthesis.org

I think I got that from either axiom.sty or perhaps some code embedded
in the Axiom book.

Regards,
Bill Page.

On Fri, Jan 15, 2010 at 11:32 AM,  <[email protected]> wrote:
> Hello,
>
> does anyone know how $\zag$ (for continued fractions)
> could be nicely implemented?
> It does not seem to be a tex command, yet is used in several places.
> For this reason continued fractions are not displayed
> in Martin's emacs TeX display mode and
> hyperdoc crashes for me when I search for it:
>   >> System error:
>      junk in string "ozag"
>
> Currently I use
> \newcommand{\zag}[2]{\frac{\left.#1\right|}{\left|#2\right.}}
> in my files, but it looks ugly.
>
> At the same time I would like to fix the missing space
> at the end of "\rightarrow" in tex.spad.
>
> regards,
> Franz
>
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