Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bundles on non-proper schemes: representability   Let X be a proper scheme over a field k which satisfies Serre's condition S2
and G a reductive group over k. We prove that the functor of principal
G-bundles defined away from a non-fixed closed subset in X of codimension at
least 3, is an algebraic stack in the sense of Artin.

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The categories of this paper are: astro-ph
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph