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C5v group

  1. Nov 23, 2015 #1
    One of the classes of the group C5v is written C=(2*C5). So why do we mean by 2*C5 and how we can know the elements of this class from this writing ?
    Thanks
     
  2. jcsd
  3. Nov 24, 2015 #2

    DrDu

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    You really mean class or rather symmetry operation? I would guess that 2*C_5 means a rotation by two times 72 degrees.
     
  4. Nov 25, 2015 #3
    I mean what means the notation of the class C'=(2C5) ,where C' is a class and 2C5 are the elements of this class.
     
  5. Nov 25, 2015 #4

    DrDu

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    Where did you see this? I don't think the C' is standard notation. The 2 C##_5## means that the class contains two elements, namely the rotations by + or - 72 degrees.
     
  6. Nov 26, 2015 #5
    So 2 C5 means : C5, C54.
    Thanks you very much that's what I want to know.
     
  7. Nov 26, 2015 #6

    DrDu

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    Yes, the two are in the same class as e.g. ##\sigma_v C_5 \sigma_v=C_5^4##.
     
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