Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bimahonian distributions   Motivated by permutation statistics, we define for any complex reflection
group W a family of bivariate generating functions. They are defined either in
terms of Hilbert series for W-invariant polynomials when W acts diagonally on
two sets of variables, or equivalently, as sums involving the fake degrees of
irreducible representations for W. It is also shown that they satisfy a
``bicyclic sieving phenomenon'', which combinatorially interprets their values
when the two variables are set equal to certain roots of unity.

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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-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: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: cs