Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recursive equations based models of queueing systems   An overview of the recursive equations based models and their applications in
simulation based analysis and optimization of queueing systems is given. These
models provide a variety of systems with a convenient and unified
representation in terms of recursions for arrival and departure times of
customers, which involves only the operations of maximum, minimum, and
addition.

19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat