Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complexes of groups and geometric small cancellation over graphs of
  groups   We explain and generalise a construction due to Gromov to realise geometric
small cancellation groups over graphs of groups as fundamental groups of
non-positively curved 2-dimensional complexes of groups. We then give
conditions so that the hyperbolicity and some finiteness properties of the
small cancellation quotient can be deduced from analogous properties for the
local groups of the initial graph of groups.

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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
3
The categories of this paper are: physics
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The categories of this paper are: hep-ex