Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Harnack inequality for fractional Laplace equations with lower order
  terms   We establish a Harnack inequality of fractional Laplace equations without
imposing sign condition on the coefficient of zero order term via the Moser's
iteration and John-Nirenberg inequality.

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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc