Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-phase flow with surfactants: Diffuse interface models and their
  analysis   New diffuse interface and sharp interface models for soluble and insoluble
surfactants fulfilling energy inequalities are introduced. We discuss their
relation with the help of asymptotic analysis and present an existence result
for a particular diffuse interface model.

26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph