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

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

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

P.S. Here is a link: front.math.ucdavis.edu/… — Jim Humphreys Sep 11 '18 at 0:17

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 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

@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

@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

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

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

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

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

@MartinSleziak Yes, it was a link to this manuscript (section 7.2 in it is relevant). Thanks. — Leonid Positselski 2 mins ago