Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Kaehler cone of a compact hyperkaehler manifold   This is an attempt towards the understanding of the (birational) Kaehler cone
of a compact hyperkaehler manifold in terms of the Beauville-Bogomolov form on
its second cohomology. We discuss birational correspondences between
hyperkaehler manifolds and their effects on the cohomology. Many of the results
are conjectural in as much as they depend on a projectivity criterion for
compact hyperkaehler manifolds contained in this paper's predecessor, but in
which a serious mistake has oocured. An erratum is given in Sect. 6 and a way
to rescue the approach is proposed in Sect. 7.

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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin