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On the weight filtration of the homology of algebraic varieties : the generalized Leray cycles

Fouad Elzein, András Némethi (2002)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

Let Y be a normal crossing divisor in the smooth complex projective algebraic variety X and let U be a tubular neighbourhood of Y in X . Using geometrical properties of different intersections of the irreducible components of Y , and of the embedding Y X , we provide the “normal forms” of a set of geometrical cycles which generate H * ( A , B ) , where ( A , B ) is one of the following pairs ( Y , ) , ( X , Y ) , ( X , X - Y ) , ( X - Y , ) and ( U , ) . The construction is compatible with the weights in H * ( A , B , ) of Deligne’s mixed Hodge structure. The main technical part...

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