Why is this no triangulation of the Klein Bottle?
Is it because the top and the bottom triangle share 3 vertices but have different edges?
How do I find a triangulation?
2026-03-25 12:53:31.1774443211
Triangulation of the Klein Bottle
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The vertices of the outer square do not remain distinct after identifying edges to create the Klein bottle. So some of your "triangles" have less than $3$ vertices.