Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the existence and construction of proper costratifying systems   In this paper we further study the notion of proper costratifying systems,
defined in \cite{MPV}. We give sufficient conditions for their existence, and
investigate the relation between the stratifying systems defined by K. Erdmann
and C. S\'aenz in \cite{ES} with the proper costratifying systems.

12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
16
The categories of this paper are: stat