Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hurewicz fibrations in elementary toposes   We study formal counterparts of Hurewicz fibrations and related topological
notions in elementary toposes with NNO. The constructions are based on a
specific notion of interval and lead to a structure of category of fibrant
objects on toposes equipped with such a datum. We get in fact slightly more as
the building blocks are derived from a weak factorisation system.

18
The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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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: dg-ga