(1) Departamento de Matemáticas, Universidad de Murcia, 30100 Espinardo, Murcia, Spain;(2) Departamento de Matemáticas, Universidad de Murcia, 30100 Espinardo, Murcia, Spain
Abstract:
In this note we show that B-scrolls over null curves in a 3-dimensional Lorentzian space form are characterized as the only ruled surfaces with null rulings whose Gauss maps G satisfy the condition being a parallel endomorphism of .