Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Optimal Odd Unimodular Lattice in Dimension 72   It is shown that if there is an extremal even unimodular lattice in dimension
72, then there is an optimal odd unimodular lattice in that dimension. Hence,
the first example of an optimal odd unimodular lattice in dimension 72 is
constructed from the extremal even unimodular lattice which has been recently
found by G. Nebe.

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The categories of this paper are: gr-qc
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The categories of this paper are: math-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: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th