Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Analysis of a Mathematical Model Describing Acid-mediated Tumor
  Invasion   We present a mathematical analysis of a reaction-diffusion model describing
acid-mediated tumor invasion. The model describes the spatial distribution and
temporal evolution of tumor cells, normal cells, and excess lactic acid
concentration. The model assumes that tumor-induced alteration of
microenvironmental pH provides a simple but complete mechanism for cancer
invasion. We provide results on the existence and uniqueness of a solution
considering Neumann and Dirichlet boundary conditions. We also provide
numerical simulations to the solutions considering both boundary conditions.

11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin