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I noticed that my comment to this answer has disappeared. Why did it happen? If the comment was flagged as outdated and then removed, I believe this is wrong. The first part of the comment was about the confusion with integration limits, that has been corrected in the answer. The second part was about a substitution which is not justified and would give a wrong result for certain input values. That part is still very much relevant.

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    $\begingroup$ No one, save for a moderator, can see the deleted comment, or decide to restore it. You should have flagged the answer on which you commented, for moderator attention, to inquire about the deleted comment, rather than posting to meta, where other users can not do anything about it. $\endgroup$
    – amWhy
    Jun 16 '20 at 16:22
  • $\begingroup$ If the second part of your Comment is still germane, you can repost it on that Answer. This (rather than flagging for moderator attention) is probably the expeditious route. $\endgroup$
    – hardmath
    Jun 16 '20 at 17:01
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    $\begingroup$ You are taking, @hardmath, the OP's perception that (at least part of) their comment was relevant. But the fact is, it was deleted by a mod. Best to flag for mod attention to review the deletion, perhaps edit the comment to exclude the obsolete, or otherwise. Telling a commenter to repost any part of a deleted comment is asking the commenter to risk further repercussions for doing so. $\endgroup$
    – amWhy
    Jun 16 '20 at 17:13
  • $\begingroup$ In any case, Maxim and @hardmath, this is a matter that mods are best equipped to handle. $\endgroup$
    – amWhy
    Jun 16 '20 at 17:15
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    $\begingroup$ @amWhy: I'm proposing the second part of the original Comment can be reposted if it "is still germane." The OP's "perception that (at least part of) their comment was relevant" deserves to be taken as of equal weight with yours, mine, or a moderator's. Are there repercussions for posting an "obsolete" comment? Let it be on my head then. $\endgroup$
    – hardmath
    Jun 16 '20 at 19:07
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    $\begingroup$ @hardmath: They could have asked that when flagging for mod attention. There is a pretty generous field in which one can express concerns to a mod, including a request to have "part of a comment restored". As I stated earlier: this is a matter that only mods are best equipped to handle. You cannot offer any arguments against that, else you'd have restored the comment by now, right? $\endgroup$
    – amWhy
    Jun 16 '20 at 19:37
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It was indeed flagged as no longer needed. Given that comment, edit, and reply to the comment were a week old, I validated the flag and deleted the comments. I did not check whether the complete comment was made obsolete by the edit, knowing one who flagged as generally reliable.

In principle, I'd support hardmath's suggestion:

If the second part of your Comment is still germane, you can repost it on that Answer.

In this specific case, your comment has already been undeleted and the obsolete part removed by a colleague.

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  • $\begingroup$ So, I take it, this matter could have and would have best been handled by flagging the post for moderator attention, explaining their issue about the deleted comment? Thanks for confirming that indeed, only a mod could rectify the matter, and that the post here is off topic for that reason. $\endgroup$
    – amWhy
    Jun 16 '20 at 20:08
  • $\begingroup$ Specifically, you confirmed: "This should not be a meta discussion, as it is a call for moderator action. Instead, the problematic post or comment should be flagged for moderator attention." $\endgroup$
    – amWhy
    Jun 16 '20 at 20:10
  • $\begingroup$ Thanks for the edit @amWhy. (Old habits die hard. :-/) I'm not so sure if this is a call for moderator action or an inquiry about a moderator action, thus I'm in doubt whether it's off-topic or not. $\endgroup$ Jun 16 '20 at 20:23
  • $\begingroup$ Well, @DanielFischer, it is certainly a matter that could only be handled by a moderator, so flagging would have been preferable as opposed to wasting users' (who could not have changed anything anyway) time. $\endgroup$
    – amWhy
    Jun 16 '20 at 20:26
  • $\begingroup$ Unless you want every user who has a comment deleted to contest it on meta. $\endgroup$
    – amWhy
    Jun 16 '20 at 20:28
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    $\begingroup$ @amWhy I agree that the issue would have been handled most efficiently via a flag. However, it can also be useful to at times to talk about certain things in more detail. For instance other users can learn from this thread that "no longer needed" is often validated quite rapidly especially if there is a comment that says "it is fixed." To avoid this, one would basically need to add another comment that a part is still relevant, or preemptively .repost the part and delete the other one. $\endgroup$
    – quid Mod
    Jun 16 '20 at 20:42
  • $\begingroup$ touche, @quid! Understood. $\endgroup$
    – amWhy
    Jun 16 '20 at 20:45
  • $\begingroup$ Thank you for clearing things up, and thanks to the people who offered suggestions. I must say I'm not quite comfortable with anyone invisibly editing what I wrote (I realize the editing wasn't done by you). But I suppose in this case it reduces the chance that the comment may be removed again. $\endgroup$
    – Maxim
    Jun 16 '20 at 21:47

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