Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Functional Pearl: Witness Me -- Constructive Arguments Must Be Guided
  with Concrete Witness   Beloved Curry--Howard correspondence tells that types are intuitionistic
propositions, and in constructive math, a proof of proposition can be seen as
some kind of a construction, or witness, conveying the information of the
proposition. We demonstrate how useful this point of view is as the guiding
principle for developing dependently-typed programs.

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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom