Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gradient theory of domain walls in thin, nematic liquid crystals films   In this paper we describe domain walls appearing in a thin, nematic liquid
crystal sample subject to an external field with intensity close to the
Fr\'eedericksz transition threshold. Using the gradient theory of the phase
transition adopted to this situation, we show that depending on the parameters
of the system, domain walls occur in the bistable region or at the border
between the bistable and the monostable region.

14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph