0-cycles de degré 0 sur les surfaces fibrées en coniques.
3-dimensional sundials
R. Hartshorne and A. Hirschowitz proved that a generic collection of lines on ℙn, n≥3, has bipolynomial Hilbert function. We extend this result to a specialization of the collection of generic lines, by considering a union of lines and 3-dimensional sundials (i.e., a union of schemes obtained by degenerating pairs of skew lines).
Нульмерные циклы на некоторых инволютивных многообразиях
О циклах коразмерности 3 на проективной квадрике