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Re: Tie over infinity

From: Shervin Afshar <shervinafshar@gmail.com>
Date: Sun, 20 Jul 2014 16:55:32 -0700
Message-ID: <CA+ONODnh-8Bm6533LTRFobkEDjsDiS_H--7uP5svFZesETt0LQ@mail.gmail.com>
To: bnb@ams.org
Cc: Murray Sargent <murrays@exchange.microsoft.com>, "www-math@w3.org" <www-math@w3.org>
Thank you for the background info, but none of these documents (including
proposals to UTC; [1], [2]) have any background about this single symbol
(which doesn't surprise me since it was proposed in a larger repertoire).
So I don't think digging in the ISO archives would make us wiser about the
background and usage.

[1]: http://www.unicode.org/L2/L2000/00002-math.pdf
[2]: http://www.unicode.org/L2/L2000/00119-math.pdf

↪Shervin

On Fri, Jul 18, 2014 at 7:12 AM, <bnb@ams.org> wrote:

>     I asked around and looked it up in some source (including Cajori), but
> to
>     no avail. Any clues about where else to look? Thanks.
>
> thanks for checking.
>
>     Shervin
>
> my records show that it was included in
> the stix requests from the isotech entity
> set associated with sgml support facilties,
> as listed in
>
>   draft technical report ISO/IEC DTR 9573-13-1990(E)
>   ISO/IEC JTC 1
>   Information technology -- SGML support facilities --
>   Techniques for using SGML --
>   Part 13
>   Public entity sets for mathematics and science
>
> which was used as the starting set for the
> stix collection.
>
> i'm not sure what the fate of this tech
> report might be; i believe it was rearranged,
> but whether it was ever voted into final
> status, i don't know.  what i *do* know,
> though, is that it was adopted into the
> w3c entity definitions for characters; see
>
>   XML Entity Definitions for Characters (2nd Edition)
>   W3C Recommendation 10 April 2014
>   http://www.w3.org/TR/xml-entity-names/
>
> and in particular
>
>   ISOTECH
>   http://www.w3.org/TR/xml-entity-names/isotech.html
>
> an update is in the works:
>
>   XML Entity Definitions for Characters (3rd Edition)
>   W3C Working Draft 16 April 2014
>   http://www.w3.org/2003/entities/2007doc/Overview.html
>
> with no change in the isotech complement.
>
> i correspond fairly regularly with both
> the editors of this recommendation (both
> of them are long-time friends), so could
> ask them if they know anything more.  but
> this has been asked before, so i'm sure
> they don't.
>
> i obtained the initial copy of 9573-13
> on paper, as a representative of ams and
> ansi to what was then iso-iec jtc1/sc18/wg8,
> the working group responsible for sgml.
> anders berglund, at the time employed in
> the iso headquarters in geneva, was also
> a member of that wg, and when the stix
> project was established, he provided me
> with electronic copies of relevant
> material, including the entity sets in
> 8879 (sgml) and 9573-13.  however, i'm
> pretty sure he didn't/doesn't know the
> source of the isotech material.  (i think
> i asked at the time, and remember being
> told they were odds and ends from no
> single source.)
>
> i don't know anyone currently in a
> position to investigate old (very old!)
> records at iso, but i'm still in contact
> with a few people who might be able to
> tell me how to find someone, if it is
> worth the effort.  let me know, please.
>                                                 -- bb
>
>
>     On Thu, Jun 26, 2014 at 6:00 PM, Murray Sargent <
>     murrays@exchange.microsoft.com> wrote:
>
>     > Anyone know how "tie over infinity" ? (29DD) is used in mathematics?
>     >
>     > Thanks,
>     > Murray
>
Received on Sunday, 20 July 2014 23:56:39 UTC

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