Relative Chow correspondences and the Griffiths group, by Eric M. Friedlander

We show that Madhav Nori's rational Lefschetz theorem provides examples in which specific levels of the "topological filtration" on algebraic cycles are non-trivial. A relativization of earlier constructions of Chow correspondences and graph mappings is used to adapt Nori's theorem to our context.

Eric M. Friedlander <>