# [texhax] The \/ control sequence

Reinhard Kotucha reinhard.kotucha at web.de
Tue May 25 05:57:24 CEST 2010

On 24 May 2010 Steve Peter wrote:

> On May 24, 2010, at 9:55 PM, Reinhard Kotucha <reinhard.kotucha at web.de> wrote:
> >> It could be used anywhere where slightly more space might be
> >> desirable, but to be kosher one might prefer \, or some more
> >> specific \hspace{...} in other situations.
> >
> > I fear that it can't be used for anything else but italic correction.
> > I assume that its horizontal width is determined from the TFM file
> > (via a fontdimen parameter) of the font you are currently using.
> > Thus, if you are currently using an upright font, \/ has no effect.
>
> It's also useful when going from bold to roman in some cases, such
> as {\bf f}', which usually looks better as {\bf f\/}' (in plain TeX
> terms).

Interesting, I didn't expect this behavior but you are definitely
right:

\setbox0\hbox{{\bf f}X} \showthe\wd0
> 11.01389pt.

\setbox0\hbox{{\bf f\/}X} \showthe\wd0
> 12.10414pt.

Regards,
Reinhard

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