Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An elementary example of a Banach space not isomorphic to its complex
  conjugate   We give a simple and explicit example of a complex Banach space which is not
isomorphic to its complex conjugate, and hence of two real-isomorphic spaces
which are not complex-isomorphic.

15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph