Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymptotic Analysis of Transport Equation in Annulus   We consider the diffusive limit of a steady neutron transport equation with
one-speed velocity in a two-dimensional annulus. A classical theorem states
that the solution can be approximated in $L^{\infty}$ by the leading order
interior solution plus the corresponding Knudsen layers in the diffusive limit.
In this paper, we construct a counterexample of this result via a different
boundary layer expansion with geometric correction.

4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg