Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Index Theory for Real Factors   The notion of index for arbitrary real factors is introduced and
investigated. The main tool in our approach is the reduction of real factors to
involutive *-anti-automorphisms of their complex enveloping von Neumann
algebras. Similar to the complex case the values of the index for real factors
are calculated.

6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga