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On compact Kähler surfaces. (English) Zbl 0926.32025
The conjecture of Kodaira that every compact complex surface $$X$$ with first Betti number $$b_1(X) \equiv 0\pmod 2$$ admits a Kähler metric follows partially from the Enriques-Kodaira classification. The remaining cases of elliptic and $$K3$$ surfaces were affirmatively answered by Y. Miyaoka [Proc. Jap. Acad. 50, 533-536 (1974; Zbl 0354.32011)] and Y.-T. Siu [Invent. Math. 73, 139-150 (1983; Zbl 0557.32004)] respectively.
The paper under review contains a general proof of the conjecture which does not make any use of the Enriques-Kodaira classification. The author also gets criteria analogous to those of Nakai-Moishezon for elements in $$H_\mathbb{R}^{1,1} (X)$$ to be representable by positive closed (1,1)-forms. The proofs are based on Hodge theory and $$L_2$$-cohomology. Main ingredients are results of P. Gauduchon on the existence of $$\partial \overline \partial$$-closed positive (1,1)-forms on compact complex surfaces, the theorem of Siu on the analyticity of the sets associated with the Lelong numbers of closed positive currents and results of Demailly about the smoothing of positive closed (1,1)-currents.

##### MSC:
 32J15 Compact complex surfaces 14J15 Moduli, classification: analytic theory; relations with modular forms 32J27 Compact Kähler manifolds: generalizations, classification 53C55 Global differential geometry of Hermitian and Kählerian manifolds 32C30 Integration on analytic sets and spaces, currents
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