Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Covering techniques in Auslander-Reiten theory   Given a finite dimensional algebra over a perfect field the text introduces
covering functors over the mesh category of any modulated Auslander-Reiten
component of the algebra. This is applied to study the composition of
irreducible morphisms between indecomposable modules in relation with the
powers of the radical of the module category.

18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th