[texhax] undertilde and MiKTeX

[Rolf Turner]

Ah, the mysteries of life!

On 28/10/17 18:50, Dieter Kilsch wrote:

> Hi,
> 
> I use MikTeX 2.9 under Windows 10. win-grep, target on the whole 
> \tex\-folder, only found "undertilde" in \tex\latex\vector\vector.sty, 
> where the command is defined. So to me there is no underline.sty or 
> undertilde.tex
> 
> I do not have a folder tex/generic/genmisc or something similar.


But conversely on 29/10/17 02:07, Jerry wrote:

> Both are present.
> 
> C:\Program Files\MiKTeX 2.9\tex\generic\genmisc\undertilde.tex
> C:\Program Files\MiKTeX 2.9\tex\latex\undertilde\undertilde.sty


Is this apparent contradiction as mysterious to others as it is to me?

Thanks to Philip Taylor and Peter Wilson who both answered my cri de 
coeur for a "conditional construction" to use the package undertilde.sty
if it's available and otherwise *input* undertilde.tex if *that* is
available.

However I haven't actually *tried* these suggestions, because David 
Carlisle wrote:

> you could do that, but to be honest undertilde package is only 5 lines
> of code, so less than the code you would need to conditionally include
> it, it also has a few issues (the tilde always comes from the same
> (displaystyle) font, unlike \widetide if amsmath is loaded)
> I think it would be better just to put a (any) definition of under
> tilde directly in your class rather than have dependencies on packages
> not generally available.

Now why didn't *I* think of that?  (Because I'm a Bear of Very Little 
Brain, I guess!)

Anyhow I'm going with David Carlisle's suggestion as being simplest
and most robust.

Thanks to all who responded to my plea for help.

cheers,

Rolf Turner

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