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Topic: Topology & Sigma Algebra
Replies: 6   Last Post: Jun 21, 2013 11:52 AM

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FredJeffries@gmail.com

Posts: 1,036
Registered: 11/29/07
Re: Topology & Sigma Algebra
Posted: Jun 21, 2013 11:52 AM
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On Friday, June 21, 2013 6:58:37 AM UTC-7, agapi...@aol.com wrote:
>
> > > Thanks.  Is B, in fact, the power set of R? If not, what elements of the power set would be missing from B?
>
> > https://en.wikipedia.org/wiki/Borel_set#Non-Borel_sets
>
>
>
> Thanks for the link.


You might also check this discussion:
http://mathoverflow.net/questions/32720/non-borel-sets-without-axiom-of-choice



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