Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Homogenization and influence of fragmentation in a biological invasion
  model   In this paper, some properties of the minimal speeds of pulsating Fisher-KPP
fronts in periodic environments are established. The limit of the speeds at the
homogenization limit is proved rigorously. Near this limit, generically, the
fronts move faster when the spatial period is enlarged, but the speeds vary
only at the second order. The dependence of the speeds on habitat fragmentation
is also analyzed in the case of the patch model.

35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org