Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Beyond the poor man's implementation of unconditionally stable
  algorithms to solve the time-dependent Maxwell Equations   For the recently introduced algorithms to solve the time-dependent Maxwell
equations (see Phys.Rev.E Vol.64 p.066705 (2001)), we construct a variable grid
implementation and an improved spatial discretization implementation that
preserve the property of the algorithms to be unconditionally stable by
construction. We find that the performance and accuracy of the corresponding
algorithms are significant and illustrate their practical relevance by
simulating various physical model systems.

33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys