Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A general method to remove the stiffness of PDEs   A new method to remove the stiffness of partial differential equations is
presented. Two terms are added to the right-hand-side of the PDE : the first is
a damping term and is treated implicitly, the second is of the opposite sign
and is treated explicitly. A criterion for absolute stability is found and the
scheme is shown to be convergent. The method is applied with success to the
mean curvature flow equation, the Kuramoto-Sivashinsky equation, and to the
Rayleigh-Taylor instability in a Hele-Shaw cell, including the effect of
surface tension.

34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin