A counter-example to the Andreotti-Grauert conjecture

Details A counter-example to the Andreotti-Grauert conjecture A counter-example to the Andreotti-Grauert conjecture

2007-10-17

arxiv.org/abs/0710.3358v2

Mathematics

Complex Variables

To appear in Global Journal of Pure and Applied Mathematics

Scientific paper

Let $X$ be an analytic complex space which is $q$-complete. Then it follows from a theorem of Andreotti-Grauert [1] that $H^{p}(X, {\mathcal{F}})=0$ for every coherent analytic sheaf ${\mathcal{F}}$ on $X$ if $p\geq q$. Until now it is not known if these two conditions are equivalent. The aim of this article is to give a counterexample to the converse of this statement. We show that there exist for each $n\geq 3$ open sets $\Omega\subset\complexes^{n}$ such that $H^{n-1}(\Omega, {\mathcal{F}})=0$ for every ${\mathcal{F}}\in coh(\Omega)$ but $\Omega$ is not $(n-1)$-complete.

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