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My user name is 111 (https://math.stackexchange.com/users/100311/111) but there is another person with this user name (https://math.stackexchange.com/users/382126/111). I noticed that, because someone replying in a chatroom to the other 111 user, sent me a message in my inbox!

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    $\begingroup$ Yes, usernames are not unique. Count for example how many (registered) users called "Frank" or "Thomas" we have. $\endgroup$ – Daniel Fischer Jan 12 '17 at 16:00
  • $\begingroup$ @DanielFischer Thanks for the reply. So, I will accept in my inbox all the replies for the other user? $\endgroup$ – 111 Jan 12 '17 at 16:02
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    $\begingroup$ No, that happens relatively rarely. For comments on the site, you two must both have commented on a post (or one of you have written or edited the post) for that to occur. Otherwise, the software knows which of you is meant by @111. In chat, it happens if both of you were active in the room in question not too long ago. Then the software doesn't know whom @111 refers to, and pings you both, iirc. $\endgroup$ – Daniel Fischer Jan 12 '17 at 16:06
  • $\begingroup$ ok, understood. Thanks. $\endgroup$ – 111 Jan 12 '17 at 16:09
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    $\begingroup$ The case of comment replies and users with the same username is discussed here: Who should be pinged by the “@<user>” feature if there is more than one match. $\endgroup$ – Martin Sleziak Jan 12 '17 at 16:23
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    $\begingroup$ And I will add that in chat multiple users can receive ping even if they do not have exactly the same name. For example, if I and other user with username MartinR were in the same chatroom, writing @Martin in chat would ping both of us. $\endgroup$ – Martin Sleziak Jan 12 '17 at 16:24
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    $\begingroup$ Maybe you could change your username to 3x37? $\endgroup$ – Gerry Myerson Jan 12 '17 at 18:39
  • $\begingroup$ yes! or 9^2+3^3+3 $\endgroup$ – 111 Jan 12 '17 at 19:17

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