Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unirational moduli spaces of some elliptic K3 surfaces   We show that the moduli space of $U\oplus \langle -2k \rangle$-polarized K3
surfaces is unirational for $k \le 50$ and $k \notin \{11,35,42,48\}$, and for
other several values of $k$ up to $k=97$. Our proof is based on a systematic
study of the projective models of elliptic K3 surfaces in $\mathbb{P}^n$ for
$3\le n \le 5$ containing either the union of two rational curves or the union
of a rational and an elliptic curve intersecting at one point.

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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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: cmp-lg
11
The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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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: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph