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Feb 22, 2019 at 21:11 history edited Michael Albanese CC BY-SA 4.0
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Apr 1, 2010 at 16:35 comment added Dan Ramras If you're interested in the fundamental group, you should look at Behrang Noohi's article arxiv.org:0710.2615. He discusses the relationship between his work and Armstrong's, although he refers to a later paper by Armstrong rather than the one Andy references above.
Oct 19, 2009 at 1:16 history answered Andy Putman CC BY-SA 2.5