Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A non-Hopfian almost convex group   In this article we prove that an "isometric multiple HNN-extension" of a
group satisfying the falsification by fellow traveler property is almost
convex. As a corollary, Wise's example of a CAT(0) non-Hopfian group is Almost
convex.

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The categories of this paper are: dg-ga
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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: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys