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Sumihiro's theorem : ウィキペディア英語版 | Sumihiro's theorem In algebraic geometry, Sumihiro's theorem, introduced by , states that a normal algebraic variety with an action of a torus can be covered by torus-invariant affine open subsets. The "normality" in the hypothesis cannot be relaxed.〔()〕 The hypothesis that the group acting on the variety is a torus can also not be relaxed.〔http://mathoverflow.net/questions/94620/bialynicki-birula-decomposition-of-a-non-singular-quasi-projective-scheme/〕 == Notes ==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Sumihiro's theorem」の詳細全文を読む
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