Remarks on approximate decompositions of the diagonal
Résumé
In this paper, we investigate, for varieties over ℂ with trivial group of 0-cycles, the gap between essential CH_0-dimension 2 and essential CH_0-dimension 0. In particular, we present sufficient (and necessary) conditions for a variety with trivial group of 0-cycles and essential CH0-dimension ≤2 to have, in fact, essential CH_0-dimension 0.