This non-regular map has a face which shares an edge with itself.
You may threfore consider that it does not qualify as an irregular map.
The figure shown and described here is not a regular map. Some of its Petrie polygons have three edges, some have four.
This non-regular map has one 18-gonal face, six vertices, and nine edges.
Its rotational symmetry group is D6.
Its dual is C1:{18,3}.
Its Petrie dual is the triangular prism.
This non-regular map has a face which shares an edge with itself.
You may threfore consider that it does not qualify as an irregular map.
Other regular maps on the C4 non-oriented surface.
Index to other pages on regular maps.
Some pages on groups
Copyright N.S.Wedd 2009