Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Moore-Penrose inverse, EP Banach space operators and EP Banach
  algebra elements   The main concern of this note is the Moore-Penrose inverse in the context of
Banach spaces and algebras. Especially attention will be given to a particular
class of elements with the aforementioned inverse, namely EP Banach space
operators and Banach algebra elements, which will be studied and characterized
extending well-known results obtained in the frame of Hilbert space operators
and $C^*$-algebra elements.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org