On higher secant varieties of rational normal scrolls
Abstract
In this paper we study the higher secant varieties of rational normal scrolls, in particular we give them as determinantal varieties. From this we can obtain, in some cases, the sequence of secant defects, generalizing to a class of varieties and to every characteristic the counterexample given by Ådlandsvik to Zak's theorem of superadditivity.The authors retain all rights to the original work without any restrictions.
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