[GAP Forum] GAP package: braid

[Dmitrii Pasechnik]

On Sat, Jan 14, 2017 at 09:48:42PM +0000, Sergey Shpectorov wrote:
> I am one of the authors of braid and mapclass, but I cannot answer why 
> sage tries to load braid. In 2012 there was some talk about porting braid 
> to sage and I believe that perhaps David Joyner wanted it ported. At least 
> his name was mentioned in the correspondence. Dima Pasechnik also played 
> some role. Dima, do you remember anything?
sure: see e.g.
https://trac.sagemath.org/ticket/13211#comment:15
We'll swap braid with mapclass 
https://trac.sagemath.org/ticket/22190

By the way, most of webpage links on
https://gap-system.org/Packages/mapclass.html
are not working.

Cheers,
Dima

> 
> Sergey
> ________________________________________
> From: forum-bounces at gap-system.org [forum-bounces at gap-system.org] on behalf of Alexander Konovalov [alexander.konovalov at st-andrews.ac.uk]
> Sent: Saturday, January 14, 2017 8:19 PM
> To: Max Horn
> Cc: z060822400814a at rezozer.net; GAP Forum
> Subject: Re: [GAP Forum] GAP package: braid
> 
> > On 14 Jan 2017, at 20:10, Max Horn <max at quendi.de> wrote:
> >
> > Dear Jerome,
> >
> > for some reason I only received your email yesterday -- presumably it was stuck in mailing list moderation? Anyway, better a late answer than non at all :-).
> 
> Yes - I've looked at moderating requests yesterday and discovered it there.
> >
> >> On 07 Dec 2016, at 16:57, Jerome BENOIT <z060822400814a at rezozer.net> wrote:
> >>
> >> Hello Forum,
> >>
> >> I have just noticed that Sage[Math] tries to pre-loads the GAP package `braid',
> >> which is not present in the GAP webpage. I guess it is an old GAP package.
> >> Can anybody confirm this ? Does anybody knows whether or not this GAP pachage
> >> has been replaced/supersedeed ?
> >
> > To the best of my knowledge, GAP never bundled a "braid" package. There is an undeposited "package" with that name, see <https://www.gap-system.org/Packages/undep.html>, but (a) that never was shipped together with GAP,
> 
> Yes, that's true.
> 
> In addition, the MapClass package (https://www.gap-system.org/Packages/mapclass.html)
> redistributed with GAP says that it is "an extension of the Braid package for GAP"
> but it does not require Braid to work.
> 
> > and (b) as far as I can tell, it is just a bunch of GAP source files, not an actual GAP package (i.e. no PackageInfo.g, init.g, read.g etc.).  Well, that said, there is also a broken link which purports to contain a "proper" package, but it points to a location on www.opensourcemath.org, and that domain expired and was taken over by a domain grabber placing ads on it.
> >
> > Anyway, if you want to find out why Sage tries to load that package, perhaps ask them? And/or query their version control system to see when (and by whom) the code to load the package was added.
> 
> Perhaps authors of Braid and MapClass, if they read the Forum, could give more light too.
> 
> HTH
> Alexander
> 
> 
> 
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