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Nov 17, 2010 at 4:13 comment added Yemon Choi Joel: that was my reading too, but I was hoping that the OP might come back and clarify (this tending to help in answering one's own questions, or getting other people to answer them).
Nov 17, 2010 at 3:26 vote accept trutheality
Nov 17, 2010 at 2:26 comment added Joel David Hamkins Yemon, in light of the question linked to by David, the OP is likely thinking of having A and B in some other background space, rather than the subspace topology on $B$.
Nov 17, 2010 at 2:08 comment added Yemon Choi Closed in what topology? I tend to view B as a closed subset of B ...
Nov 17, 2010 at 1:33 comment added David Roberts I would mention mathoverflow.net/questions/46279 in relation to this question, and the OP's answer to it.
Nov 17, 2010 at 1:25 answer added Joel David Hamkins timeline score: 5
Nov 17, 2010 at 1:11 history asked trutheality CC BY-SA 2.5