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Re: @U{xxxx} -- some TeX characters with a capital don't seem to work

From: Norbert Preining
Subject: Re: @U{xxxx} -- some TeX characters with a capital don't seem to work
Date: Wed, 5 Jul 2017 18:57:01 +0900
User-agent: NeoMutt/20170609 (1.8.3)

> It says:
>   \mathchardef\triangle="0234
> But what is that code, 0234?  It isn't Unicode.  So what is it
> referring to?

The position in the default OT1 encoding of TeX. That is not unicode.

> Now the question becomes: how do I tell pdftex to use xetex?

pdftex and xetex are different programs. Binary programs.
You cannot tell pdftex to use xetex. You can either use
pdftex as engine, and any of the formats (like latex, ...)
or use xetex as engine (engine meaning underlying program) and
any of the formats (xelatex, ...)

> > resting on one corner. There's probably no harm in using \diamond for
> > both U+22C4 and U+25C7.
> I don't think that is a good idea.  If I specify a certain code,
> and later copy-paste something out of a document and get a different
> code... that's not good.

You mix glyph codes and appearance.

> But it appears that copy-pasting out of a PDF does not work for
> most special characters.  A bullet works, but an "ê" becomes "^e "
> and "△" becomes "4".  :|

Yes, so it is, unless you use a unicode aware underlying engine (xetex,


PREINING Norbert                               http://www.preining.info
Accelia Inc.     +    JAIST     +    TeX Live     +    Debian Developer
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