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Jan 14, 2013 at 1:09 vote accept Wei Wang
Jan 13, 2013 at 3:16 comment added Wei Wang Thanks for pointing out this reference. But I can not download the paper. However, now I have a construction of a second order model $M$ of $(1) + \neg B\Sigma_2$. As space is limited in a comment, I put it as another answer.
Jan 12, 2013 at 13:31 history answered alexod CC BY-SA 3.0