Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Symplectic Cobordisms   In this note we make several observations concerning symplectic cobordisms.
Among other things we show that every contact 3-manifold has infinitely many
concave symplectic fillings and that all overtwisted contact 3-manifolds are
``symplectic cobordism equivalent.''

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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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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: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th