Fields of Ga Invariants are Ruled

Fields of Ga Invariants are Ruled
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Ga 不变量的域是规则的

DOI:
10.4153/cmb-1994-006-0
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发表时间:
1994
期刊:
Canadian Mathematical Bulletin
影响因子:
--
通讯作者:
D. Finston
D. Finston
中科院分区:
--
文献类型:
--
作者:
J. K. Deveney;D. Finston

文献摘要

被引文献

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摘要本文证明了ck上的一个有理Ga作用的不变量环的商域是可定的。因此,所有对C4的合理Ga动作都是合理的三角化。此外,如果对cn的任意有理Ga作用加倍为对C2n的Ga × Ga作用,则该加倍作用可合理三角化。
Abstract The quotient field of the ring of invariants of a rational Ga action on C n is shown to be ruled. As a consequence, all rational Ga actions on C4 are rationally triangulable. Moreover, if an arbitrary rational Ga action on C n is doubled to an action of Ga × Ga on C2n, then the doubled action is rationally triangulable.