Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A reaction-diffusion system to better comprehend the unlockdown:
  Application of SEIR-type model with diffusion to the spatial spread of
  COVID-19 in France   A reaction-diffusion model was developed describing the spread of the
COVID-19 virus considering the mean daily movement of susceptible, exposed and
asymptomatic individuals. The model was calibrated using data on the confirmed
infection and death from France as well as their initial spatial distribution.
First, the system of partial differential equations is studied, then the basic
reproduction number, R0 is derived. Second, numerical simulations, based on a
combination of level-set and finite differences, shown the spatial spread of
COVID-19 from March 16 to June 16. Finally, scenarios of unlockdown are
compared according to variation of distancing, or partially spatial lockdown.

7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg