Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A signed version of Putnam's homology theory: Lefschetz and zeta
  functions   A signed version of Putnam homology for Smale spaces is introduced. Its
definition, basic properties and associated Lefschetz theorem are outlined. In
particular, zeta functions associated to an Axiom A diffeomorphism are
compared.

6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg