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I just noticed (by looking at my reputation) that I accidentally downvoted the following answer:

Oscillation of the summatory Möbius function

This was (probably) because I was reading the question in my tablet computer (not the best one in the market), and I wanted to upvote that answer, but accidentally pressed the downvote button with my stupid finger. I tried to upvote it now, but the system tells me that, since 20 hours have passed, my vote is locked.

Is there any way to reverse this error of mine?

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So, I asked the guy who answered the question to edit his answer. The answer was edited and I upvoted it. Problem solved.

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