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00925njm 22002777a 4500 dc Arrondo Esteban, Enrique author Bertolini, Marina author Turrini, Cristina author 2011 In this paper we study the normal bundle of the embedding of subvarieties of dimension n - 1 in the Grassmann variety of lines in P(n). Making use of some results on the geometry of the focal loci of congruences ([4] and [5]), we give some criteria to decide whether the normal bundle of a congruence is ample or not. Finally we apply these criteria to the line congruences of small degree in P(3). 0933-7741 http://dx.doi.org10.1515/FORM.2011.004 https://hdl.handle.net/20.500.14352/42078 http://search.ebscohost.com/login.aspx?direct=true&db=aph&AN=59745397&site=ehost-live On the ampleness of the normal bundle of line congruences