The algebraic dimension of compact complex threefolds with vanishing second Betti number

Details The algebraic dimension of compact complex threefolds with vanishing second Betti number The algebraic dimension of compact complex threefolds with vanishing second Betti number

1996-07-08

arxiv.org/abs/math/9607215v1

Mathematics

Algebraic Geometry

Scientific paper

We investigate compact complex manifolds of dimension three and second Betti number $b_2(X) = 0$. We are interested in the algebraic dimension $a(X)$, which is by definition the transcendence degree of the field of meromorphic functions over the field of complex numbers. The topological Euler characteristic $\chi_{\mathrm{ top}}(X) $ equals the third Chern class $c_3(X)$ by a theorem of Hopf. Our main result is that, if $X$ is a compact 3-dimensional complex manifold with $b_2(X) = 0$ and $a(X) > 0$, then $c_3(X) = \chi_{\rm top}(X) = 0$, that is, we either have $b_1(X) = 0, \ b_3(X) = 2$ or $b_1(X) = 1, \ b_3(X) = 0.$

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