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8:08 AM
This old question was bumped recently: What is Koszul duality? Since it is rather old, it is not surprising that the answers contain some links that are not working.
In an effort to understand this answer I worked out some detais, gathered references, gave a seminar talk and puta all of this on my webpage: heinrich-hartmann.net/wiki/index.php/Koszul_Duality. — Heinrich Hartmann Jun 15 '12 at 20:24
@HeinrichHartmann could you revive the link? Or has it been removed on purpose? — მამუკა ჯიბლაძე May 5 '17 at 9:59
@მამუკაჯიბლაძე At least some version can be found in the Wayback Machine. (I will add also arXiv link from the answer - since the front end is down for some time.) — Martin Sleziak 3 hours ago
@MartinSleziak Thank you very much, Martin! Extremely helpful, as always — მამუკა ჯიბლაძე 1 hour ago
Also in another answer, this link: math.uchicago.edu/~mitya/langlands/hitchin
The last link in the answer seems to be dead. Is it supposed to be a link to the paper Quantization of Hitchin’s Integrable System and Hecke eigensheaves by A. Beilinson and V. Drinfeld? — Martin Sleziak 2 hours ago
 
8:58 AM
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Q: Is it time to replace links to the UCDavis arXiv frontend?

Peter LeFanu LumsdaineThis question from March 2020 points out that many questions/answers link to papers at the http://front.math.ucdavis.edu/ frontend instead of at the arXiv itself, but that the frontend had been down a few weeks. There are c.600 affected questions and the great majority of the links could be fixe...

This would probably be the first "automated link correction" in the Stack Exchange network. (But it's possible that I do not know about such undertaking. Here I do not count changes concerning links within the Stack Exchange network - I mean external links.)
 
9:16 AM
SEDE returns 26 posts where the string front.math.ucdavis.edu was removed: data.stackexchange.com/mathoverflow/query/1070272/…
 
9:29 AM
There might be also some links to an author rather than to a paper. I only see 4 such posts on the main and no comments.
For some links, it is straightforward how they should be changed: http://front.math.ucdavis.edu/0909.1810 will be https://arxiv.org/abs/0909.1810.
What will work for links such as here:
I am not so familiar with historic iteration (front.math.ucdavis.edu/math.LO/9607227), but it seems to me that this is quite different from our paper. Our forcings are not ccc, and our forcing looks more like a product than an iteration, in the sense that there is no obvious linear order on the coordinates; each "iterand" produces a real which is somewhat generic over all the others. Also (bug or feature?) we do not increase $\mathfrak d$. At the moment. — Goldstern May 4 '14 at 16:33
It seems that http://front.math.ucdavis.edu/math.LO/9607227 should be https://arxiv.org/abs/math/9607227.
This concerns at least 42 posts and 9 comments.
Also posts to searches might need special handling - I found 6 posts and 9 comments.
I see that I have mentioned something along these lines in the previous discussion:
Perhaps the automated transformation would be less straightforward for links not to articles but to searches, authors, categories, etc. But probably there isn't too many of them here are a few examples. — Martin Sleziak Apr 21 '20 at 8:30
If some kind of automation is considered, a reasonable thing to do might be to get the list of all links to this domain in posts/comments - so that we can check what various formats are employed here.
 
9:56 AM
Links of the form front.math.ucdavis.edu/categories in 1 post and 2 comments.
If you send an appeal to the arXiv staff, then ordinarily you would get a human answer and not just an automatically generated reply. If that process doesn't look reasonable, then you can send e-mail, not necessarily to me personally, but to an appropriate moderator (see front.math.ucdavis.edu/categories/math) or to the advisory committee (see front.math.ucdavis.edu/about , although the physics committee there is not current). — Greg Kuperberg May 14 '12 at 18:46
This comment is also example of link to front.math.ucdavis.edu/about. I found no posts and only this comment.
> For links to older preprints, the fix is less clear — see some examples at this edit history. Does anyone else know or see how the correspondence between arXiv and arXiv-front url’s works for these? Otherwise I guess these would be left to be fixed by hand afterwards.
I see there one link to search: http://front.math.ucdavis.edu/search?a=&t=&q=tower+of+hanoi&c=&n=25&s=Listings was changed to https://arxiv.org/search/math?query=tower+of+hanoi&searchtype=title. The other links seem follow the pattern suggested in the post:
> Search-and-replace suggestion: For links to preprints after April 2007, the correspondence is straightforward — we want to replace a url like http://front.math.ucdavis.edu/0809.1179 with https://arxiv.org/abs/0809.1179, and the first four digits represent YYMM.
@PeterLeFanuLumsdaine Are you sure that this revision history is an example you want? This seems to be link to a search rather than a link to and article in the "old format". I left a few more comment in MO editors' lounge. — Martin Sleziak 56 secs ago
I will also add that replacement for https://front.math.ucdavis.edu should be the same as for https://fron.math.ucdavis.edu. But I guess this is obvious.
 
10:20 AM
I have to admit that the regex 1|0[8-9]|071|070[4-9] is a bit unclear to me.
 
10:36 AM
@MartinSleziak: The edit diff in that link shows three different kinds of example: one search link, which I don’t think we could hope to fix by regex; two of the post-April-2007 links that my suggested regex should fix; and two of the pre-April-2007 links that might or might not be regex-able. — Peter LeFanu Lumsdaine 4 mins ago
My mistake. I thought that by "pre-2007" you mean links of the form similar to https://front.math.ucdavis.edu/math.LO/9909115. — Martin Sleziak 16 secs ago
So far I only checked a few hyperlinks, but in the ones I tried, I only had to omit the number 5:
But we should check more links to see how this works.
I am not sure what to do with links such as http://front.math.ucdavis.edu/0107.4705 or http://front.math.ucdavis.edu/0312.4730.
I recently updated mathoverflow.net/a/132018/16302. It contained four links starting with http://front.math.ucdavis.edu/ (and a search link, which I'll ignore here). For two of these, a simple search-and-replace works, using the replacement https://arxiv.org/abs/. But for the other two I needed to use https://arxiv.org/abs/math/ and remove a .5 from the final part of the url. I do not know why this is. — jeq Apr 30 '20 at 2:42
56 mins ago, by Martin Sleziak
I will also add that replacement for https://front.math.ucdavis.edu should be the same as for https://fron.math.ucdavis.edu. But I guess this is obvious.
What I wanted to write there was https and http. I.e., https://front.math.ucdavis.edu should be handled in the same way as http://front.math.ucdavis.edu.
 
11:52 AM
Looking at only the posts (not comments) I count about 900 links. Of them, more than 250 start with 00-06. And about 60 start with 92-99. So I guess that there are at least 300 links where it's unclear how to transform them. @AsafKaragila Wouldn't it be better to contact SE staff only after we know how the URLs can be transformed? Or is the intention to find out whether this is possible in principle and to deal with the problematic parts later? — Martin Sleziak 30 mins ago
@MartinSleziak: Right — the confusing thing is that for pre-2007 papers, the frontend seems to provide url’s in at least two different forms, some like the example you give, some like the ones in the edit history I linked. For the ones in the edit history, the correspondence with arXiv’s url/identifier is totally unclear to me. For examples like your form, the conversion is clearer — the identifier math.LO agrees with the arXiv, so we just need to change the url prefix — but it would take a little thought to write a regex that’ll recognise url’s of that form without false positives. — Peter LeFanu Lumsdaine 29 mins ago
@Martin: The [status-review] puts the thing on their todo list, which is probably long enough that it will take a while. We absolutely should figure out the algorithm for replacing until then, though. — Asaf Karagila ♦ 21 mins ago
@AsafKaragila I did not want to add too many comments to the post on meta. (There is already many of them - so I posted here instead.) I will sent you invite into this room, so you should get some kind of notification.
Since the frontend was maintained by Greg Kuperberg - who is a MO user - maybe he would be willing (an able) to help with the correspondence between the identifiers on arxiv.org and on the front.math.ucdavis.edu.
Would the MO moderators be willing to contact him - or at least let him know about the question on meta?
In case somebody wants to play with the links a bit - I only made a very naive check so far. From SEDE I got the texts of the questions and the comments containing this URL.
I downloaded the result, added newline before URL and then selected the relevant lines and sorted them.
 
12:15 PM
Maybe ".47" corresponds to "math-ph"? It worked for the following links:
The names of authors mentioned in the posts suggest that this might be the correct papers.
 
12:29 PM
Probably I should try at least some links before 2000:
Again, at least the names of the authors on arXiv and the names mentioned in the MO posts correspond.
 
1:00 PM
On Mathematics, there are 22 posts and 14 comments. That is something that can be corrected manually.
 
1:14 PM
Maybe for some of them it is removing .5 and adding /math and replacing .47 by 0 and adding /math-ph? (But I only tested it on a few URLs.) — Martin Sleziak 53 mins ago
 
1:36 PM
There are also three posts containing front.math.ucdavis.edu/q-alg. I did not find any such comments.
One post and no comments with front.math.ucdavis.edu/abs.
 
 
1 hour later…
2:39 PM
Thanks! With the status-review, I hope we'll attract the attention of some StackOverlords soon. I'll see if I can speed it up as well. — Asaf Karagila ♦ 5 hours ago
Looking at only the posts (not comments) I count about 900 links. Of them, more than 250 start with 00-06. And about 60 start with 92-99. So I guess that there are at least 300 links where it's unclear how to transform them. @AsafKaragila Wouldn't it be better to contact SE staff only after we know how the URLs can be transformed? Or is the intention to find out whether this is possible in principle and to deal with the problematic parts later? — Martin Sleziak 3 hours ago
@Martin: The [status-review] puts the thing on their todo list, which is probably long enough that it will take a while. We absolutely should figure out the algorithm for replacing until then, though. — Asaf Karagila ♦ 3 hours ago
@AsafKaragila I will just add that one additional disadvantage of adding (status-review) is that it prevents the post from the community bulletin. So less people from the MO community will see the post.
 
 
2 hours later…
4:44 PM
@MartinSleziak Yes, it was a link to this manuscript (section 7.2 in it is relevant). Thanks. — Leonid Positselski 2 mins ago
 

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