Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On contact surgery   In this note we show that $+1$-contact surgery on distinct Legendrian knots
frequently produces contactomorphic manifolds. We also give examples where this
happens for $-1$-contact surgery. As an amusing corollary we find overtwisted
contact structures that contain a large number of distinct Legendrian knots
with the same classical invariants and tight complements.

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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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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: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: physics