tea.mathoverflow.net - Discussion Feed (Reasking a question, whose answer was wrong)

jbl comments on "Reasking a question, whose answer was wrong" (8858)

jbl — Mon, 06 Sep 2010 15:15:49 -0700

Leaving a comment on someone's answer causes a little alert to draw their attention; leaving another answer on the same question does not. Also, in this case everyone involved has their contact information available through their user page; you could have alerted them via an e-mail.

Martin B. comments on "Reasking a question, whose answer was wrong" (8857)

Martin B. — Mon, 06 Sep 2010 15:02:46 -0700

For those who claimed that I left no comment in the question: Actually I've written an "answer" in which I reveal the problems of the accepted proof.

My general meta-question is not answered yet, but in this case, this question alone made the experts paying attention to the MO-question ... :)

François G. Dorais comments on "Reasking a question, whose answer was wrong" (8856)

François G. Dorais — Mon, 06 Sep 2010 12:11:09 -0700

Thanks for pointing this out! I made a comment on the accepted answer. I think there may be a way to make the argument work, but it is by no means trivial to do. The problem has to do with the fact that NBG cannot comprehend classes using formulas that quantify over classes, which is an essential part of the usual argument.

(Edit: Joel has now posted a detailed answer.)

Ben Webster comments on "Reasking a question, whose answer was wrong" (8854)

Ben Webster — Mon, 06 Sep 2010 10:31:19 -0700

By the way, I've done you a favor and fixed the grammar in the question, so it's on the front page now. Better strike while the iron is hot.

Ben Webster comments on "Reasking a question, whose answer was wrong" (8853)

Ben Webster — Mon, 06 Sep 2010 10:30:09 -0700

Like jbl says, you shouldn't even consider this until you've left a comment on the question. As a general rule, posting a duplicate question is not a good solution to any problem.

jbl comments on "Reasking a question, whose answer was wrong" (8849)

jbl — Mon, 06 Sep 2010 08:53:50 -0700

You appear to not have left a comment on either the question or the accepted answer (which would help attract the attention of their writers) -- I would suggest you start with that.

Martin B. comments on "Reasking a question, whose answer was wrong" (8847)

Martin B. — Mon, 06 Sep 2010 06:02:32 -0700

Assume that there is a question which has been answered on MO (and also accepted), but you find out that the answer is wrong. However, it seems that nobody likes to help you to find out the correct answer. Actually I'm thinking of

http://mathoverflow.net/questions/1124/does-cantor-bernstein-hold-for-classes

Is it then ok just to post a new, identical question with a link to the former and some new thoughts about it? I would like to do that since otherwise the question does not get enough attention.