ON THE GALOIS COHOMOLOGY OF SPIN(14)
ON THE GALOIS COHOMOLOGY OF SPIN(14)
复制标题
论自旋的伽罗瓦上同调(14)
DOI:
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发表时间:
2006
期刊:
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通讯作者:
M. Rost
中科院分区:
文献类型:
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作者:
M. Rost
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.