ON THE GALOIS COHOMOLOGY OF SPIN(14)

ON THE GALOIS COHOMOLOGY OF SPIN(14)
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论自旋的伽罗瓦上同调(14)

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发表时间:
2006
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通讯作者:
M. Rost
M. Rost
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作者:
M. Rost

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设k是一个char k6=2的域,对于i=6,7,我们定义了不变量hi:H(k,→(14))−Hi(k,Z/2)/(−1)Hi−1(k,Z/2)。进一步证明了自然映射H(k,(G2×G2)oμ8)→H(k,Spin(14))是满射的。其中一个结论是自旋(14)的本质维度等于7。对于自旋(12)也做了类似的考虑。我们还给出了n≤14的分裂群Spin(N)的本质维列表。
Let k be a field with char k 6= 2. For i = 6, 7 we define invariants hi : H ( k,Spin(14) ) → Hi(k,Z/2)/(−1)Hi−1(k,Z/2). Further we show that the natural map H ( k, (G2 ×G2) o μ8 ) → H ( k,Spin(14) ) is surjective. One concludes that the essential dimension of Spin(14) is equal to 7. Similar considerations are done for Spin(12). We also present the list of essential dimensions of the split groups Spin(n) for n ≤ 14.