Re: Math styles

[Hans Åberg]

> On 26 May 2017, at 19:42, Gavin Smith <address@hidden> wrote:

> I couldn't reproduce this error.

Thanks for the help.

I had an old texindex version. With latest texinfo 6.3, I get the same result 
as you, if I do not use the OTF hack.

BTW, TexLive 2017 is out June 1, in less a week, so it probably has a later 
LuaTeX.

> (this is with texindex in awk, the version of texindex distributed with 
> Texinfo 6.0 and later), which is all valid UTF-8.  The resulting
> index looks fine too, with glyphs for all the characters that were used.
> Does this input file not work for you?

Looks fine, except for that I also used:
  @cindex 𝕥
  @cindex 𝕗
and they do not show, as they are Unicode mathematical styles. The same problem 
as before.

Also, perhaps these single characters should be assembled into one group in the 
typeset index, instead of starting a new one.

Some books have a separate symbols index, sometimes more than one for different 
symbol categories, sometimes listed in the order of appearance rather any 
lexicographical order.