T a b l e of C o n t e n t s
Introduction page v I j
Part I : A brief survey of Noether-Lefschetz
problems
§ 1 The Noether-Lefschetz theorem 1
§ 2 Components of the Noether-Lefschetz locus 6
§ 3 Higher dimensional problems 9
Part II : The Picard group of a general surface
containing a space curve
S 1 Introduction 13
§ 2 Some classical facts 15
§ 3 The results 26
Part III : The Picard group of some general surfaces in P
r
§ 1 Introduction 57
§ 2 The generalization of Theorem II.3.1 in Pn*2 58
§ 3 The Picard group of general residual surfaces
in
P4
65
til
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