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I recently asked a question about the beginning of a proof in a book.

Artudo Magidin helped me greatly, but it took me 2 days until I understood the answer and could accept it. Now I have another question about the end of the same proof. I left it as a comment there. Will he notice it? What is the appropriate thing to do to make him or someone else notice this new comment which is in some way a follow up question?

(I can post it as a new question, but since it's about the same proof, I'm not sure if this is the appropriate thing to do on math.stackexchange).

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    $\begingroup$ Since you commented on an answer he wrote, he already received a notification of it. In general (e.g. if you want to respond to someone else's comment) use the @ symbol together with their username (I think you can take the part of their username before the first space). This will cause a notification to pop up. $\endgroup$ – Qiaochu Yuan Nov 26 '10 at 14:28
  • $\begingroup$ @Qiaochu Yuan: Thank you. I want him to notice the latest comment on my original question, and not the one on his answer. He used @user3533 earlier and I didn't notice a notification. Where do they show? $\endgroup$ – user3533 Nov 26 '10 at 14:38
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    $\begingroup$ The orange envelope on the top. I don't think you are a registered user, which is probably why you aren't receiving notifications. $\endgroup$ – Qiaochu Yuan Nov 26 '10 at 14:39
  • $\begingroup$ The "StackExchange" dropdown at the upper left corner of the site ought to have a red circle with the number of unread comments/answers for you. Otherwise, there's the envelope... $\endgroup$ – J. M. isn't a mathematician Nov 26 '10 at 14:40
  • $\begingroup$ @Qiaochu: S/he's registered; s/he didn't fill in a username though so the name looks generic. $\endgroup$ – J. M. isn't a mathematician Nov 26 '10 at 14:41
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    $\begingroup$ I see. Does the notification function work if you don't fill in a username? I can't find user3533 via a user search. $\endgroup$ – Qiaochu Yuan Nov 26 '10 at 14:44
  • $\begingroup$ Next time someone answers me with "@user3533" I'll answer that. $\endgroup$ – user3533 Nov 26 '10 at 15:02
  • $\begingroup$ I infer from Jeff's answer here that you can't be notified if you're nameless. $\endgroup$ – J. M. isn't a mathematician Nov 26 '10 at 15:15
  • $\begingroup$ By the way, iirc, you need only use enough of the username to uniquely match the most recent posts (but at least 3 chars), e.g. @use, or @Qia to notify the authors of the 2nd and 3rd most recent posts above. Qiaochu: did it notify you? $\endgroup$ – Gone Nov 26 '10 at 16:49
  • $\begingroup$ Confirmed, you can get notices if you are unregistered. Before I registered, I used to get these notices all the time. $\endgroup$ – Matt Calhoun Nov 30 '10 at 15:00
  • $\begingroup$ Editing the question to include the next part of your question will increase the visibility to others by bringing it to the top of the first page. $\endgroup$ – BBischof Dec 5 '10 at 21:51
  • $\begingroup$ @user3533: Did it work? $\endgroup$ – Charles Jun 30 '11 at 16:39
  • $\begingroup$ @Charles: I get notifications, but it turns out that I was registered to begin with so it's not very surprising. $\endgroup$ – user3533 Jun 30 '11 at 16:44
  • $\begingroup$ @QiaochuYuan: If I want multiple persons get notified, then? $\endgroup$ – Inquisitive Jan 4 '13 at 18:49
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A few changes since this was asked

  1. It is no longer possible to be nameless; you will be named user12345 at a minimum.

  2. Click the help link next to the comment submit button to see basic help, which includes notification info.

    commenting help

  3. Comment syntax is also documented on https://math.stackexchange.com/editing-help

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