Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Liftable D_4-Covers   Let k be an algebraically closed field of characteristic p and let G be a
subgroup of Aut(k[[t]]) be a faithful action on a local power series ring over
k. Let R be a discrete valuation ring of characteristic 0 with residue field k.
One asks, whether it is possible to find a faithful action G inside Aut(R[[t]])
which reduces to the given action, i.e. a lift to characteristic 0. We show
that liftable actions exists in the case that G = D_4 and p = 2. In fact we
introduce a family, the supersimple D_4 -actions, which can always be lifted to
characteristic 0.

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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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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: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int