On the Rost divisibility of henselian discrete valuation fields of cohomological dimension 3
On the Rost divisibility of henselian discrete valuation fields of cohomological dimension 3
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上同调维数3的Henselian离散估值域的Rost整除性
DOI:
10.2140/akt.2020.5.677
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发表时间:
2019-04
期刊:
影响因子:
--
通讯作者:
Zhengyao Wu
中科院分区:
文献类型:
--
作者:
Yong Hu;Zhengyao Wu
Let $F$ be a field, $\ell$ a prime and $D$ a central division $F$-algebra of $\ell$-power degree. By the Rost kernel of $D$ we mean the subgroup of $F^*$ consisting of elements $\lambda$ such that the cohomology class $(D)\cup (\lambda)\in H^3(F,\,\mathbb{Q}_{\ell}/\Z_{\ell}(2))$ vanishes. In 1985, Suslin conjectured that the Rost kernel is generated by $i$-th powers of reduced norms from $D^{\otimes i},\,\forall i\ge 1$. Despite of known counterexamples, we prove some new cases of Suslin's conjecture. We assume $F$ is a henselian discrete valuation field with residue field $k$ of characteristic different from $\ell$. When $D$ has period $\ell$, we show that Suslin's conjecture holds if either $k$ is a $2$-local field or the cohomological $\ell$-dimension $\mathrm{cd}_{\ell}(k)$ of $k$ is $\le 2$. When the period is arbitrary, we prove the same result when $k$ itself is a henselian discrete valuation field with $\mathrm{cd}_{\ell}(k)\le 2$. In the case $\ell=\car(k)$ an analog is obtained for tamely ramified algebras. We conjecture that Suslin's conjecture holds for all fields of cohomological dimension 3.
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影响因子:
0.8
作者:
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DOI:
10.1051/978-2-7598-2067-2
发表时间:
2020-11
期刊:
--
影响因子:
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作者:
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DOI:
10.1070/im1983v021n02abeh001793
发表时间:
1983-04
期刊:
Mathematics of The Ussr-izvestiya
影响因子:
--
作者:
A. S. Merkur’ev;A. Suslin
通讯作者:
A. S. Merkur’ev;A. Suslin