Let X⊂Pr be a variety of almost minimal degree which is the projected image of a rational normal scroll X~⊂Pr+1 from a point p outside of X⊂. In this paper we study the tangent spaces at singular points of X and the geometry of the embedding scrolls of X, i.e. the rational normal scrolls Y⊂Pr which contain X as a codimension one subvariety.
ASJC Scopus subject areas
- Algebra and Number Theory