Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Iterative q difference Galois Theory   We propose in this paper a Galois theory of $q$-difference equations where q
is a root of unity. This theory is the q difference analogue of the Galois
theory of iterative differential equations, that is differential equations over
fields of positive characteristic. This theory contains and generalizes the
Galois theory of q difference equations developed by Singer and van der Put.

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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci