Remarks on quasi-polarized varieties

Remarks on quasi-polarized varieties
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准极化品种备注

DOI:
10.1017/s0027763000001562
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发表时间:
1989
影响因子:
0.8
通讯作者:
T. Fujita
T. Fujita
中科院分区:
数学2区
文献类型:
--
作者:
T. Fujita

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令 V 为变数,这意味着在任何特征的代数闭域上都有一个不可约的简化射影格式。如果对于 V 中的任何曲线 C LC ≥ 0,则 V 上的线束 L 被称为 nef。因此,“nef”绝不是“在数值上等价于有效除数”的缩写。如果 k (L) = n = dim V,则称 L 为大。在 L 为 nef 的情况下,当且仅当 Ln > 0 时,L 为大(参见 [F7; (6.5)]。当 L 为 nef 且大时,对 (V, L) 将称为准极化簇。
Let V be a variety, which means, an irreducible reduced projective scheme over an algebraically closed field of any characteristic. A line bundle L on V is said to be nef if LC ≧ 0 for any curve C in V. Thus, “nef” is never an abbreviation of “numerically equivalent to an effective divisor”. L is said to be big if k (L) = n = dim V. In case L is nef, it is big if and only if Ln > 0 (cf. [F7; (6.5)]. When L is nef and big, the pair (V, L) will be called a quasi-polarized variety.