The Frobenius morphism in invariant theory II
The Frobenius morphism in invariant theory II
复制标题
不变理论中的 Frobenius 态射 II
DOI:
10.1016/j.aim.2022.108587
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发表时间:
2022
影响因子:
1.7
通讯作者:
Raedschelders T
中科院分区:
文献类型:
--
作者:
Raedschelders T
Let R be the homogeneous coordinate ring of the Grassmannian G= Gr (2, n) defined over an algebraically closed field k of characteristic p≥ max{n− 2, 3}. In this paper we give a description of the decomposition of R, considered as graded R p r-module, for r≥ 2. This is a companion paper to [16], where the case r= 1 was treated, and taken together, our results imply that R has finite F-representation type (FFRT). Though it is expected that all rings of invariants for reductive groups have FFRT, ours is the first non-trivial example of such a ring for a group which is not linearly reductive. As a corollary, we show that the ring of differential operators D k (R) is simple, that G has global finite F-representation type (GFFRT) and that R provides a noncommutative resolution for R p r.
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J. T. Stafford
DOI:
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发表时间:
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期刊:
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