The lightcone Gauss map and the lightcone developable of a spacelike curve in Minkowski 3-space
We define the notion of lightcone Gauss maps, lightcone pedal curves and lightcone developables of spacelike curves in Minkowski 3-space and establish the relationships between singularities of these objects and geometric invariants of curves under the action of the Lorentz group.(Received May 18 1998)
1 On leave from Department of Mathematics, North East Normal University, Chang Chun 130024, P.R. China.