Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Problem reduction, renormalization, and memory   Methods for the reduction of the complexity of computational problems are
presented, as well as their connections to renormalization, scaling, and
irreversible statistical mechanics. Several statistically stationary cases are
analyzed; for time dependent problems averaging usually fails, and averaged
equations must be augmented by appropriate memory and random forcing terms.
Approximations are described and examples are given.

26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio