no. 1-2
Immersed spheres in symplectic 4-manifolds
Annales de l'Institut Fourier, …, Tome 42 (1992) no. 1-2, pp. 369-392

We discuss conditions under which a symplectic 4-manifold has a compatible Kähler structure. The theory of J-holomorphic embedded spheres is extended to the immersed case. As a consequence, it is shown that a symplectic 4-manifold which has two different minimal reductions must be the blow-up of a rational or ruled surface.

Nous étudions des conditions sous lesquelles une variété symplectique de dimension 4 admet une structure kählérienne compatible. La théorie des sphères plongées J-holomorphes est généralisée au cas immergé. Nous démontrons comme conséquence qu’une variété symplectique de dimension 4 qui a deux réductions minimales, est nécessairement l’éclatement d’une surface rationnelle ou réglée.

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     author = {Duff, Dusa Mc},
     title = {Immersed spheres in symplectic 4-manifolds},
     journal = {Annales de l'Institut Fourier},
     pages = {369--392},
     year = {1992},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {42},
     number = {1-2},
     doi = {10.5802/aif.1296},
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     zbl = {0756.53021},
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Duff, Dusa Mc. Immersed spheres in symplectic 4-manifolds. Annales de l'Institut Fourier, …, Tome 42 (1992) no. 1-2, pp. 369-392. doi: 10.5802/aif.1296

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