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• W2964271407 abstract "Let G be a finite group acting on k(x1,…,xn), the rational function field of n variables over a field k. The action is called a purely monomial action if σ⋅xj=∏1⩽i⩽nxiaij for all σ∈G, for 1⩽j⩽n where (aij)1⩽i,j⩽n∈GLn(Z). The main question is that, under what situations, the fixed field k(x1,…,xn)G is rational (= purely transcendental) over k. This rationality problem has been studied by Hajja, Kang, Hoshi, Rikuna when n⩽3. In this paper we will prove that k(x1,x2,x3,x4)G is rational over k provided that the purely monomial action is decomposable. To prove this result, we introduce a new notion, the quasi-monomial action, which is a generalization of previous notions of multiplicative group actions. Moreover, we determine the rationality problem of purely quasi-monomial actions of K(x,y)G over k where k=KG." @default.
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• W2964271407 date "2014-02-01" @default.
• W2964271407 modified "2023-10-16" @default.
• W2964271407 title "Quasi-monomial actions and some 4-dimensional rationality problems" @default.
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• W2964271407 doi "https://doi.org/10.1016/j.jalgebra.2014.01.019" @default.
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