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I noticed in a few questions, such as What does a nonstandard proof of Con(PA) look like? , that the user name that asked the question appears in grey but is not linked. What does that indicate?

Follow up: it is a deleted user (as I suspected might be the case). What is the process for an answer to a question like this to be marked as accepted, if the original user is no longer able to do it?

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    $\begingroup$ Questions by a deleted user can never be marked accepted, even moderators are not able to do that. Answers can only be accepted by the user asking the question. $\endgroup$ – user9733 Nov 23 '12 at 7:25
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The user who asked this question was QED, who asked to be deleted over a year ago I believe.

Deleted users are not linked, of course.


As for the edit, I doubt there is a way to have your answer accepted. However once an answer is upvoted, the question will not be bumped automatically anymore.

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It also happens that a question got migrated to any-other.stackexchange.com. The OP might not have an account there. Then his name will also appear in grey.

See here.

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