Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Group Actions as Stroboscopic Maps of Ordinary Differential Equations   Discrete-time dynamical systems can be derived from group actions. In the
present work possibility of application of this method to systems of ordinary
differential equations is studied. Invertible group actions are considered as
possible candidates for stroboscopic maps of ordinary differential equations.
It is shown that flow of the Bloch equation is a unique suspension of an
invertible map on the SU(2) group.

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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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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: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph