Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some identities involving second kind Stirling numbers of types $B$ and
  $D$   Using Reiner's definition of Stirling numbers of the second kind in types $B$
and $D$, we generalize two well-known identities concerning the classical
Stirling numbers of the second kind. The first identity relates them with
Eulerian numbers and the second identity interprets them as entries in a
transition matrix between the elements of two standard bases of the polynomial
ring $R[x]$. Finally, we generalize these identities to the group of colored
permutations $G_{m,n}$.

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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin