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In one of the talks of J.P. May he mentioned some examples of structure groups and their classification spaces (he mentioned: O, U, SO, SU, Sp, Spin, String, Top, STop, F and SF). Most of them are familiar with me, but I never heard of the structure group String. Googling isn't helping much, because you always find yourself reading some physics article. The question is simple:

  • What does the group $String$ mean in the context of fibre bundles?
  • In what articles / books are they explained ?
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    Why, there is an infinite Postnikov tower (FiveBrane is a 7-connected cover but there is a 8-connected cover and so on).2011-11-25

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You could try the nLab page

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    Thanks for your usefuk remark. I shall put nLab in my favorites.2011-11-24