Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cospans and spans of graphs: a categorical algebra for the sequential
  and parallel composition of discrete systems   We develop further the algebra of cospans and spans of graphs introduced by
Katis, Sabadini and Walters for the sequential and parallel composition of
processes, adding here data types.

30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int