What they're doing here on MathOverflow is relatively harmless. They're also active on other sites in the Stack Exchange network, where they are posting downright abusive stuff; here are some examples. That doesn't mean they're forbidden to participate here, but it speaks volumes. Do note that sometimes users don't register themselves (because they don't ...


The user has changed to another username Math is like Friday. (Just answering to make the possibility of considering the issue as solved.)

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