the National Natural Science Foundation of China (No. 10471020); the Program for New Century Excellent Talents in University of China (No. 05-0319).
In this paper,we give the classification of the singularities of hyperbolic Darboux image and rectifying Gaussian surface of nonlightlike curve in Minkowski 3-space.We establish the relationship between the singularit...
Supported by the National Natural Science Foundation of China(10471020)
We consider the mixed arrangement which is composed of the central hyperplane arrangement and a sphere. We discuss the lattice of its intersection set and the relationship between the Mobius function of the mixed arra...