Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Associated Lah numbers and r-Stirling numbers   We introduce the associated Lah numbers. Some recurrence relations and
convolution identities are established. An extension of the associated Stirling
and Lah numbers to the r-Stirling and r-Lah numbers are also given. For all
these sequences we give combinatorial interpretation, generating functions,
recurrence relations, convolution identities. In the sequel, we develop a
section on nested sums related to binomial coefficient.

30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga