arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0907.3855math.AG
收藏

作为具有无穷小结构的格簇的Demazure分解

Demazure resolutions as varieties of lattices with infinitesimal structure

Martin Kreidl

摘要:

设k是一个具有正特征的域。对于特殊线性群中标准极大环面的每一个支配余权λ,构造了k上仿射空间的多重Hilbert概型的闭子簇D(λ),使得D(λ)的k值点可以解释为k((z))^n中具有无穷小结构的格.此外,对于任意λ,我们构造了从D(λ)到与λ相关联的Schubert簇在仿射格拉斯曼中的Demazure分解的泛同胚。D(λ)中的格具有非平凡的无穷小结构当且仅当它们位于大胞腔的边界上。

英文摘要:

Let k be a field of positive characteristic. We construct, for each dominant coweight λof the standard maximal torus in the special linear group, a closed subvariety D(λ) of the multigraded Hilbert scheme of an affine space over k, such that the k-valued points of D(λ) can be interpreted as lattices in k((z))^n endowed with infinitesimal structure. Moreover, for any λwe construct a universal homeomorphism from D(λ) to a Demazure resolution of the Schubert variety associated with λin the affine Grassmannian. Lattices in D(λ) have non-trivial infinitesimal structure if and only if they lie over the boundary of the big cell.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑