Nonemptiness of skew-symmetric degeneracy loci
| dc.creator | Graham, William | |
| dc.date | 2003-05-15 | |
| dc.date.accessioned | 2026-07-07T04:58:02Z | |
| dc.date.available | 2026-07-07T04:58:02Z | |
| dc.description | Let V be a rank N vector bundle on a d-dimensional complex projective scheme X; assume that V is equipped with a skew-symmetric bilinear form with values in a line bundle L and that Λ^2 V^* \otimes L is ample. Suppose that the maximum rank of the form at any point of X is r, where r>0 is even. The main result of this paper is that if d>2(N-r), then the locus of points where the rank of the form is at most r-2 is nonempty. This is a skew-symmetric analogue of the main result of math.AG/0305159; the proof is similar. If the hypothesis of ampleness is relaxed, we obtain a weaker estimate on the maximum dimension of X (and give a similar result for the symmetric case). We give applications to subschemes of skew-symmetric matrices, and to the stratification of the dual of a Lie algebra by orbit dimension. | |
| dc.description | 13 pages | |
| dc.identifier | https://arxiv.org/abs/math/0305221 | |
| dc.identifier | http://arxiv.org/abs/math/0305221 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/67477 | |
| dc.subject | Algebraic Geometry | |
| dc.subject | 14N05 | |
| dc.title | Nonemptiness of skew-symmetric degeneracy loci | |
| dc.type | text |