Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A particle system approach to aggregation phenomena   Inspired by a PDE-ODE system of aggregation developed in the biomathematical
literature, an interacting particle system representing aggregation at the
level of individuals is investigated. It is proved that the empirical density
of the individual converges to solution of the PDE-ODE system.

26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg