Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some isometry groups of Urysohn space   We constract various subgroups of the group of isometries of universal
Urysohn spaces (unique complete separable metric space which is iniversal and
homogeneous) including abelian groups which act transitively, and free groups
which are dense in the full isometry group.

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The categories of this paper are: comp-gas
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The categories of this paper are: chem-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: q-bio
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The categories of this paper are: q-fin
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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: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th