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Item _em_icos_virus_shells.triangulation_num

Description

   The triangulation number (T number) is a geometric and abstract
    concept that does not correspond to the structural components of
    an individul virus.
    It refers to the organisation of the geometric figure.
    The triangulation number, T is given by the following relationship:
    T= h*2 + hk +k*2,  where h and k are positive integers which define the 
    position of the five-fold vertex on the original hexagonal net.

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