Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galilea relativity and its invariant bilinear forms   We construct the family of bilinear forms gG on R3+1 for which Galilea boosts
and spatial rotations are isometries. The key feature of these bilinear forms
is that they are parametrized by a Galilea invariant vector whose physical
interpretation is rather unclear. At the end of the paper, we construct the
Poisson bracket associated to the (nondegenerate) antisymmetric part of gG.

31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
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The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: stat
5
The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess