Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New results on EP elements in rings with involution   In this paper, we mainly give characterizations of EP elements in terms of
equations. In addition, a related notion named a central EP element is defined
and investigated. Finally, we focus on characterizations of a generalized EP
element, i.e. *-DMP element.

30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
16
The categories of this paper are: stat