Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extensions of Cuntz-Krieger algebras   We show that a C*-algebra "looking like" a Cuntz-Krieger algebra is a
Cuntz-Krieger algebra. This implies that, in an appropriate sense, the class of
Cuntz-Krieger algebras is closed under extensions of real rank zero.

17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th