Sextics and Spheres

Wednesday, May 30, 2007 - 2:00pm - 2:30pm
EE/CS 3-180
Ciprian Borcea (Rider University)
A generic configuration of three spheres determines several sextic
curves, all related to the curve of common tangents. First among them,
the direction-sextic, which records only the direction of these
tangents, retains in fact, as a planar projective complex curve,
enough information for reconstructing the sphere configuration, up to

I shall discuss properties of this family of sextics and the resulting
criterion for classifying configurations.