The separating variety for 2 × 2 matrix invariants
The separating variety for 2 × 2 matrix invariants
复制标题
2 × 2 矩阵不变量的分离变换
DOI:
10.1080/03081087.2022.2158300
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发表时间:
2023
影响因子:
1.1
通讯作者:
Elmer J
中科院分区:
文献类型:
--
作者:
Elmer J
LetGbe a linear algebraic group acting linearly on a vector space (or more generally, an affine variety), and letbe the corresponding algebra of invariant polynomial functions. A separating setis a set of polynomials with the property that for all, if there existsseparatingand, then there existsseparatingand. In this article, we consider the action of G=GL2(C) on the-vector spaceofn-tuples ofmatrices by simultaneous conjugation. Minimal generating setsofare well known and. In recent work, Kaygorodov et al. [Kaygorodov I, Lopatin A, Popov Y. Separating invariants formatrices. Linear Algebra Appl. 2018;559:114-124.] showed that for all,is a minimal separating set by inclusion, i.e. that no proper subset ofis a separating set. This does not necessarily mean thathas minimum cardinality among all separating sets for. Our main result shows that any separating set forhas cardinality. In particular, there is no separating set of size dim(C[M2n]G)=4n−3 for. Further,has indeed minimum cardinality as a separating set, but forthere may exist a smaller separating set than. We show that a smaller separating set does in fact exist for all. We also prove similar results for the left–right action of SL2(C)×SL2(C) on.
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DOI:
10.1016/j.jsc.2008.10.001
发表时间:
2009
期刊:
J. Symb. Comput.
影响因子:
--
作者:
L. Bedratyuk
通讯作者:
L. Bedratyuk
影响因子:
1.7
作者:
Emilie Dufresne;J. Jeffries
通讯作者:
J. Jeffries
影响因子:
0.7
作者:
Emilie Dufresne;M. Kohls
通讯作者:
M. Kohls
影响因子:
0.9
作者:
Emilie Dufresne;M. Kohls
通讯作者:
M. Kohls
影响因子:
1.1
作者:
M. Domokos
通讯作者:
M. Domokos