Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Normal forms for sub-Lorentzian metrics supported on Engel type
  distributions   We construct normal forms for Lorentzian metrics on Engel distributions under
the assumption that abnormal curves are timelike future directed Hamiltonian
geodesics. Then we indicate some cases in which the abnormal timelike future
directed curve initiating at the origin is geometrically optimal. We also give
certain estimates for reachable sets from a point.

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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: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
1
The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex