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Hermitian spin surfaces with small eigenvalues of the Dolbeault operator

Bogdan Alexandrov — 2004

Annales de l'Institut Fourier

We study the compact Hermitian spin surfaces with positive conformal scalar curvature on which the first eigenvalue of the Dolbeault operator of the spin structure is the smallest possible. We prove that such a surface is either a ruled surface or a Hopf surface. We give a complete classification of the ruled surfaces with this property. For the Hopf surfaces we obtain a partial classification and some examples

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