<紀要論文>
NON-RATIONALITY OF PROJECTIVE APPROXIMATIONS FOR CLASSIFYING SPACES
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| 概要 | Let BG be the classifying space of an algebraic group G over a subfield k of the complex numbers C. We compute a new stable birational invariant defined by Benoist and Ottem [Duke Math. J. 170 (2021),... 2719–2753] as the difference of two coniveau filtrations of a smooth projective (Ekedahl) approximation X of BG×P^∞. Then we show (without and with the unramified cohomology) that in many cases X are not stable rational.続きを見る |
詳細
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| 登録日 | 2026.07.23 |
| 更新日 | 2026.07.24 |
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