Rationalité d’un fibré en coniques

Rationalité d’un fibré en coniques
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圆锥形纤维的合理性

DOI:
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发表时间:
2013
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影响因子:
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通讯作者:
Jean
Jean
中科院分区:
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文献类型:
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作者:
Jean

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F.坎帕纳曾问过某个三重是否合理。F.卡坦尼斯湾Oguiso和T. T. Truong最近证明了这个变种对于一个特定的三重锥丛是双有理的,他们证明了这个锥丛是单有理的。通过计算平面函数场布劳尔群中元素的留数,证明了该三重圆锥丛与另一个三重圆锥丛是双有理的,而后者显然是有理簇。
F. Campana had asked whether a certain threefold is rational. F. Catanese, K. Oguiso and T. T. Truong have recently shown that this variety is birational to a specific conic bundle threefold, which they show is unirational. Computing residues of elements in the Brauer group of the function field of the plane, I prove that that conic bundle threefold is birational to another conic bundle threefold, and the latter is clearly a rational variety.