Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum particle on a Mobius strip, coherent states and projection
  operators   The coherent states for a quantum particle on a M\"{o}bius strip are
constructed and their relation with the natural phase space for fermionic
fields is shown. The explicit comparison of the obtained states with previous
works where the cylinder quantization was used and the spin 1/2 was introduced
by hand is given, and the relation between the geometrical phase space,
constraints and projection operators is analyzed and discussed.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th