Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finitary incidence algebras   We consider the functions in two variables on an arbitrary poset, for which
the convolution operation is defined. We obtain the generalization of incidence
algebra and describe its properties: invertibility, the Jackobson radical,
idempotents, regular elements. As a consequence a positive solution of the
isomorphism problem for such algebras is obtained.

31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex