Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Forms of an affinoid disc and ramification   Let $k$ be a complete nonarchimedean field and let $X$ be an affinoid closed
disc over $k$. We classify the tamely ramified twisted forms of $X$.
Generalizing work of P. Russell on inseparable forms of the affine line we
construct explicit families of wildly ramified forms of $X$. We compute the
class group and the Grothendieck group of forms of $X$ in certain cases.

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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph