Surfaces on the Severi line

Surfaces on the Severi line
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Severi 线上的表面

DOI:
10.1016/j.matpur.2015.11.012
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发表时间:
2015
期刊:
arXiv: Algebraic Geometry
影响因子:
--
通讯作者:
L. Stoppino
L. Stoppino
中科院分区:
--
文献类型:
--
作者:
M. A. Barja;R. Pardini;L. Stoppino

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设S是最大Albanese维数的一般型极小复曲面,根据Severi不等式,有KS2 ≥ 4χ(OS).我们证明了等式KS2 = 4χ(OS)成立当且仅当q(S):= h1(OS)= 2,且S的正则模型是在一个至多具有可忽略奇点的充分因子上分支的Albanese曲面的双覆盖.
Let S be a minimal complex surface of general type and of maximal Albanese dimension; by the Severi inequality one has KS2 ≥ 4χ(OS). We prove that the equality KS2 = 4χ(OS) holds if and only if q(S) := h1(OS) = 2 and the canonical model of S is a double cover of the Albanese surface branched on an ample divisor with at most negligible singularities.