Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Incompressible limit of a continuum model of tissue growth for two cell
  populations   This paper investigates the incompressible limit of a system modelling the
growth of two cells population. The model describes the dynamics of cell
densities, driven by pressure exclusion and cell proliferation. It has been
shown that solutions to this system of partial differential equations have the
segregation property, meaning that two population initially segregated remain
segregated. This work is devoted to the incompressible limit of such system
towards a free boundary Hele Shaw type model for two cell populations.

17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph