Bounds on fake weighted projective space

Bounds on fake weighted projective space
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DOI:
10.2996/kmj/1245982903
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发表时间:
2008-05
影响因子:
0.6
通讯作者:
A. Kasprzyk
A. Kasprzyk
中科院分区:
数学4区
文献类型:
--
作者:
A. Kasprzyk

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伪加权射影空间X是Picard数为1的Q-阶乘环面簇。与加权投影空间一样,X配备了一组权重(\xA_0,...,\ lambda_n)。我们可以看到P(\xDda_0,...,\)的奇点是如何lambda_n)影响X的奇异性,以及权重如何限制固定维度的可能伪加权投影空间的数量。最后,如果我们希望X只有终端(或正则)奇点,我们给出了比值\lambda_j/\sum\lambda_i的上界。
A fake weighted projective space X is a Q-factorial toric variety with Picard number one. As with weighted projective space, X comes equipped with a set of weights (\lambda_0,...,\lambda_n). We see how the singularities of P(\lambda_0,...,\lambda_n) influence the singularities of X, and how the weights bound the number of possible fake weighted projective spaces for a fixed dimension. Finally, we present an upper bound on the ratios \lambda_j/\sum\lambda_i if we wish X to have only terminal (or canonical) singularities.