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5.11 Vertex Shapes

The following vertex shapes can appear in an interactive lattice:

  • circle

    Subgroup is not normal in whole group.

  • diamond

    Subgroup is normal in whole group.

  • rectangle

    Subgroup has an index that is too big for automatic calculation of normality. So it is not yet known whether this group is normal.

    Automatic calculation is controlled by the following variable:

  • GGLLimitForIsNormalCalc V

    Only for subgroups with index smaller than this number an automatic IsNormal test is performed when the vertex is added to the sheet.

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    xgap manual
    Mai 2003