Kähler metrics on elliptic surfaces
Kähler metrics on elliptic surfaces
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DOI:
10.3792/pja/1195518827
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发表时间:
1974
期刊:
影响因子:
--
通讯作者:
Y. Miyaoka
中科院分区:
文献类型:
--
作者:
Y. Miyaoka
The purpose o this note is to outline a proof o the following Theorem. An elliptic surface admits a Kghler metric if and only if its first Betti number is even. Professor Kodaira raised a problem" Does every compact analytic surface with an even first Betti number admit a Kihler metric ? Our theorem solves this problem in the affirmative except the case in which the surface is a K3 surface. 1. Some cohomology groups on elliptic surfaces. Let be an elliptic surface with a section o" z/-B. We employ the notation o Kodaira [2]. Thus J, G and [ denote, respectively, the functional invariant o B, the homological invariant o B and the normal bundle of o(z/) in B. The ollowing proposition is due to Shioda [5]. Proposition 1. There exist canonical homomorphisms " HI(, G)--]*(H2(B, Z)) cH2(B, )), : HI(I, (())H(B, (), such that () () () Im a is a commensurable subgroup of ]*(H(B, Z)), fl is an isomorphism, the diagram