Dihedral Group/Examples/D1
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Example of Dihedral Group
The dihedral group $D_1$ is the symmetry group of the line segment:
Let $AB$ be a line segment.
The symmetry mappings of $AB$ are:
- The identity mapping $e$
- The rotation $r$ of $180 \degrees$ about the midpoint of $AB$.
This group is known as the symmetry group of the line segment.