The singularity at the origin for this function has six tangent directions. The function is extremely flat near the singularity, so this model is a good test-case for singularity-detection.

This function can also be defined in the polar form as
*r= a sin(3 theta)
*

Comments to: pisces@geom.umn.edu

Last modified: Sun Nov 26 16:29:03 1995

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