Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On K-theoretic invariants of semigroup C*-algebras attached to number
  fields, Part II   This paper continues the study of K-theoretic invariants for semigroup
C*-algebras attached to ax+b-semigroups over rings of algebraic integers in
number fields. We show that from the semigroup C*-algebra together with its
canonical commutative subalgebra, it is possible to reconstruct the zeta
function of the underlying number field as well as its ideal class group (as a
group). In addition, we give an alternative interpretation of this result in
terms of dynamical systems.

21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph