Images for Mathematics

A rosette

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At first sight, this rosette seems to have various symmetry. Indeed, the external circular annulus (without the internal drawing) would have a dihedral symmetry of type D25 (if the marron rhombi were all alikeā€¦!), but the drawing inside the annulus has a cyclic symmetry of type C8. Since 8 doesn't divide 25 (between the orange points of the internal wheel there are always 3 points of the external annulus, but in one case there are 4 points), there are no rotations that fix the figure (besides the imprecisions of the drawing).

The image belongs to the sections...:
1. (C1) (Symmetry)


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