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Rotaion group

  1. May 2, 2008 #1
    I was wondering if anyone can help me to show that the subset of SO(3) contaning all
    matrices A with det(A+id)=0 is a submanifold diffeomorphic to real projective plane.
    Thanks.
     
  2. jcsd
  3. May 2, 2008 #2

    Hurkyl

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    Well, what ideas have you had on it so far? Where are you stuck?
     
  4. May 2, 2008 #3
    Actually, I could show that SO(3) is homeo. to RP^3. But on don't know why the condition det(A+id)=0 implies that this subset would be diffeo. to RP^2.
     
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