关于无穷小群概形的本质维数
代数几何
2010-10-26 v3 数论
摘要
我们讨论了群概形的本质维数,特别关注无穷小群概形。我们证明,在域k上有限型群概形的本质维数至少等于其李代数维数与自身维数之差。此外,我们证明在特征p>0的域上,长度为p^{n}的可三角化群概形的本质维数至多为n。我们给出了几个例子。
引用
@article{arxiv.1001.3988,
title = {On the essential dimension of infinitesimal group schemes},
author = {Dajano Tossici and Angelo Vistoli},
journal= {arXiv preprint arXiv:1001.3988},
year = {2010}
}
备注
11 pages; proof of Theorem 1.2 slightly changed; improved the exposition in section 4 and added Proposition 4.3. Accepted for publication in The American Journal of Mathematics