Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exact solution of an inverse spherical two phase Stefan problem   In this paper, we represent the exact solution of a two phase inverse
spherical Stefan problem, where along with unknown temperature functions heat
flux function has to be determined. Suggested solution is obtained from new
form of integral error function and its properties which are represented in the
form of series whose coefficients have to be determined. The model problem can
be used for mathematical modeling and investigation of arc phenomena in
electrical contacts.

9
The categories of this paper are: nlin
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat