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math.AG2004★ 3 cited
On tangents to quadric surfaces
Ciprian Borcea, Xavier Goaoc, Sylvain Lazard +1
We study the variety of common tangents for up to four quadric surfaces in projective three-space, with particular regard to configurations of four quadrics admitting a continuum o…
math.AG2002★ 22 cited
Point Configurations and Cayley-Menger Varieties
Ciprian S. Borcea
Equivalence classes of -point configurations in Euclidean, Hermitian, and quaternionic spaces are related, respectively, to classical determinantal varieties of symmetric, gener…