Index

Topology dictionary (topoCIF) version 0.9.6

_topol_node.vertex_symbol

Definition:

   
    The vertex symbol of a node provides similar information to the
    _topol_node.extended_point_symbol, but only for rings, which are circuits
    that contain no shortcuts, that is, are not the sum of  two
    smaller circuits. There may be circuits that cannot be rings. If
    there are no rings meeting at a particular angle of the node, the
    symbol '*' is used instead of the 'A^a' symbol. It is sorted so
    shortest rings come first. For 4-coordinated nodes only, the
    angles are grouped in opposite pairs; ab,cd and ac,bd and ad,bc
    (written in lexicographic order smallest numbers first). In the
    ordering the symbol '*' is equivalent to zero.

Type: Text

Category:
topol_node