>>> See the line above which is in CMU Concrete!
>
>> ??? I use Emacs to read my e-mail, and emacs is configured to use
>> the font 'DejaVu Sans Mono' on my GNU/Linux box. This font
>> contains Cyrillic glyphs...
>
> I composed that line in the email using CMU Concrete. Presumably
> your email client changes that.
You have (correctly) sent a plain text e-mail, which doesn't preserve
any font information...
>> None of those fonts contain Cyrillic glyphs.
>
> OK, that's fine by me. I was confused as earlier emails referred to
> the font family,
Just for clarification. A font family 'Foo' traditionally consists of
'Foo Regular', 'Foo Bold', 'Foo Italic', and 'Foo Bold Italic'. Some
font families contain *much* more series – Computer Modern (CM) is
such an example[1] – others contain only a single one. The PDFs as
produced by texinfo use CM (plus some other, additional fonts, as
mentioned in a previous e-mail).
Note that 'CMU Concrete' is a completely different thing; while based
on CM, it is not part of it. With 'part of it' I mean that
historically it wasn't part of the fonts that TeX has started many
years ago.
> not the version of the font that are used in the documentation
> project, which you tell me is a subset.
What I'm talking about has nothing to do with font versions.
Werner
[1] To be more precise, CM is a collection of various font families.