Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A real open book not fillable by a real Lefschetz fibration   A real 3- or 4-manifold has by definition an orientation preserving smooth
involution acting on it. We consider Lefschetz fibrations of 4-dimensional
manifolds-with-boundary and open book decompositions on their boundary in the
existence of a real structure. We prove that there is a real open book which
cannot be filled by a real Lefschetz fibration, although it is filled by
non-real Lefschetz fibrations.

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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
9
The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph