Witt kernels of bilinear forms for algebraic extensions in characteristic 2

Witt kernels of bilinear forms for algebraic extensions in characteristic 2
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特征 2 中代数扩张的双线性形式的 Witt 核

DOI:
10.1090/s0002-9939-05-08175-x
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发表时间:
2005
影响因子:
0.8
通讯作者:
D. Hoffmann
D. Hoffmann
中科院分区:
数学2区
文献类型:
--
作者:
D. Hoffmann

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令F为特征2的域,令K/F为指数1的纯粹不可分的扩展。我们分别确定F和K的双线性形式的维特环之间的自然限制映射W F → WK 的核W(K/F)。这补充了 Laghribi 的结果,Laghribi 计算了此类扩展 K/F 的二次形式 Witt 群的内核。基于这个结果,我们将确定一类广泛的有限扩展的 W(K/F),这些扩展不一定是纯粹不可分的。
Let F be a field of characteristic 2 and let K/F be a purely inseparable extension of exponent 1. We determine the kernel W(K/F) of the natural restriction map W F → WK between the Witt rings of bilinear forms of F and K, respectively. This complements a result by Laghribi who computed the kernel for the Witt groups of quadratic forms for such an extension K/F. Based on this result, we will determine W(K/F) for a wide class of finite extensions which are not necessarily purely inseparable.