I could have sworn that, sometime in the last month, I saw a question along the following lines:

Let $v$ and $w$ be elements of the symmetric group. Let $X(v) \subset \mathrm{Flags}(n)$ be the Schubert variety indexed by $v$. Let $w X(v)$ be the image of $X(v)$ under $S_n \subset GL_n$ acting on $\mathrm{Flags}(n)$. What is the limit of $w X(v)$ under the Gelfand-Tsetlin degeneration?

I don't have any new ideas about this question, but I recently learned that Allen Knutson is interested in some related questions, so I wanted to put him in touch with the OP.

I can't find this question anywhere. Was it deleted? Does anyone remember who posted it?

  • $\begingroup$ Maybe it was a dream? I recently had learned that a result which I mentioned for the past three-four years to people, including remembering the title of the paper, the authors and the formulation of the theorem, was all but a dream-generated memory. (The said author had told me that he has no idea how to obtain this result, but if I have even the slightest of ideas, I should let him know.) $\endgroup$ – Asaf Karagila Sep 9 '16 at 9:18
  • $\begingroup$ is this the one? mathoverflow.net/questions/2203/… $\endgroup$ – Carlo Beenakker Sep 9 '16 at 9:25
  • $\begingroup$ I'd guess that (searching) and (specific-question) would be a reasonable tags for this meta post. (I cannot edit on meta, that's why suggestion in a comment. I wish I had something more constructive to contribute here. Feel free to flag this comment as obsolete or ping me in chat to let me know that it can be deleted - after the retagging it would be a completely unnecessary noise.) $\endgroup$ – Martin Sleziak Sep 10 '16 at 8:57
  • $\begingroup$ I guess you are aware of this: Mods can search among deleted questions. Other users can only search for their own deleted posts, which does not help in this instance. If the past cases are any indication, the MO mods do their best to help with requests like yours (two recent examples here or here.) $\endgroup$ – Martin Sleziak Sep 10 '16 at 9:38
  • $\begingroup$ Maybe it's worth mentioning that using SEDE, regular users have some limited way to find deleted questions. (Although 10k+ reputation is needed to actually see them.) For example, all deleted questions which were tagged (schubert-varieties) can be found using this query. $\endgroup$ – Martin Sleziak Dec 17 '18 at 10:54
  • $\begingroup$ And since I've commented on a rather old post, I might as well add one more SEDE query. It is possible to restrict this to posts which were deleted within some date range - but viewing all such questions would make a list too long to go through one by one. Probably with restriction to a specific tag it is possible to make list short enough for this type of search. (But the answer suggests that there was no such post.) $\endgroup$ – Martin Sleziak Dec 17 '18 at 11:07

Just to narrow things down, it seems that no question resembling your description has been deleted in the last 6 months.

  • $\begingroup$ Thanks for doing this, Scott. I am confused, but I guess it will remain a mystery, because I have by now fairly thoroughly searched the non-deleted questions and not found it. $\endgroup$ – David E Speyer Sep 14 '16 at 18:12

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