Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spreading speeds of nonlocal KPP equations in heterogeneous media   In this paper, we prove the existence of the spreading speed of nonlocal KPP
equations in two cases: 1. The media is almost periodic and the kernel of
diffusion is continuous; 2. The media is periodic and the diffusion is not
continuous but weak irreducible. To do this, we develop the theory of
generalized principal eigenvalues, the method homogenization and special
Harnack's inequalities of nonlocal diffusion equations.

22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex