Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical Lagrangians for Momentum Dependent Lorentz Violation   Certain momentum-dependent terms in the fermion sector of the
Lorentz-violating Standard Model Extension (SME) yield solvable classical
lagrangians of a type not mentioned in the literature. These cases yield new
relatively simple examples of Finsler and pseudo-Finsler structures. One of the
cases involves antisymmetric $d$-type terms and yields a new example of a
relatively simple covariant lagrangian.

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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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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: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: astro-ph