Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Abelian Hopf Cohomology   We introduce non-abelian cohomology sets of Hopf algebras with coefficients
in Hopf modules. We prove that these sets generalize Serre's non-abelian group
cohomology theory. Using descent techniques, we establish that our construction
enables to classify as well twisted forms for modules over Hopf-Galois
extensions as torsors over Hopf-modules.

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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org