Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical Manipulation for spin-1/2 Systems   By means of the inverse techniques we analyse the evolution of purely
spin-1/2 systems in homogeneous magnetic fields as well as the generation of
exact solutions. Some ``evolution loops'', dynamical processes for which any
state evolves cyclically, are presented, and their corresponding geometric
phases are evaluated

0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ