Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unobstructedness of hyperk\"ahler twistor spaces   A family of irreducible holomorphic symplectic (ihs) manifolds over the
complex projective line has unobstructed deformations if its period map is an
embedding. This applies in particular to twistor spaces of ihs manifolds.
Moreover, a family of ihs manifolds over a subspace of the period domain
extends to a universal family over an open neighborhood in the period domain.

13
The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph