It happens that I proved an elementary result about the commutant (or centralizer) of a matrix; the result is elementary but nice and can be useful; the method is also elementary. my first reaction was "it is known", but I did not find, I asked colleagues , no one knows. Then I decided to ask on Mathoverflow if the result is known; the question was refused then deleted. Taking this into account I went to stackexchange, same reaction. May I ask : what is the good forum to ask colleagues about a new (or not ?) result? I apologize for my poor English.

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    $\begingroup$ Elementary questions are on-topic for this site, while they are not on-topic on MathOverflow. As such, you can probably ask here on MSE. Did you already try that? $\endgroup$ – user296602 Sep 5 '17 at 17:47
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    $\begingroup$ I don't see any questions of yours here since 2015. I don't see any recently closed or deleted questions on matrices. What are you talking about? $\endgroup$ – Gerry Myerson Sep 5 '17 at 23:08
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    $\begingroup$ "I went to stackexchange, same reaction" Which Stack Exchange site are you referring to? $\endgroup$ – Joel Reyes Noche Sep 6 '17 at 0:14
  • $\begingroup$ my question was deleted last days from mathstackexchange and, before put on hold and desappeared from mathoverflow. the subject: simultaneous trigonalization (or block trigonalization) of the commutant. $\endgroup$ – teller Sep 6 '17 at 8:09
  • $\begingroup$ If needed I give more details; I admit that the result is elementary and I admit the proof is elementary. nevertheless it is interesting,taking into account the interest in the question of commutativity and nilpotence etc... So my question was : is such a result known ? I did not get any answer except reactions insisting that it is not the goof place, ok so what would be the place ? $\endgroup$ – teller Sep 6 '17 at 8:14
  • $\begingroup$ You can try editing the question. That should put it in the review queue. Maybe the edited version will receive a better reception than the original, and it will be undeleted and reopened. If it goes through the review queue without being undeleted, then you can use math.meta.stackexchange.com/questions/19042/… to ask for undeletion and reopening (but be sure to link to the question, or no one will know what you're talking about). $\endgroup$ – Gerry Myerson Sep 6 '17 at 13:37
  • $\begingroup$ I will add link to Math.SE copy Simultaneous trigonalizability of the commutant of a matrix and link to MO copy Trigonalizability of the commutant of a matrix of your question. (Since they are deleted, apart from the OP they are only visible to 10k+ users.) $\endgroup$ – Martin Sleziak Sep 18 '17 at 3:19

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