Permutation Groups Induced by Derksen Groups in Characteristic Two
Permutation Groups Induced by Derksen Groups in Characteristic Two
复制标题
特征二中 Derksen 群导出的置换群
DOI:
10.1007/s40306-020-00391-1
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发表时间:
2020
影响因子:
0.5
通讯作者:
Hakuta Keisuke
中科院分区:
文献类型:
--
作者:
Wang Zheng;Li Fangtao;Ota Kaoru;Dong Mianxiong;Wu Bin;Hakuta Keisuke
We consider the so-calledDerksen groupwhich is a subgroup of the polynomial automorphism group of the polynomial ring innvariables over a field. The Derksen group is generated by affine automorphisms and one particular non-linear automorphism. Derksen (1994) proved that if the characteristic of the underlying field is zero andn≥ 3, then the Derksen group is equal to the entire tame subgroup. The result is calledDerksen’s Theorem. It is quite natural to ask whether the same property holds for positive characteristic. In this paper, we point out that the question can be easily answered negatively when the underlying field is of characteristic two. We shall also prove that the permutation group induced by the Derksen group over a finite field of characteristic two is a proper subgroup of the alternating group on then-dimensional linear space over the finite field. This is a stronger result that Derksen’s Theorem does not hold when the underlying field is a finite field of characteristic two.
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