Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the computation of the third order terms of the series defining the
  center manifold for systems of delay differential equation   When studying a general system of delay differential equation with a single
constant delay, we encounter a certain lack of uniqueness in determining the
coefficient of one of the third order terms of the series defining the center
manifold. We solve this problem by considering a perturbation of the considered
problem, perturbation that allows us to remove the singularity. The result
generalizes a similar result obtained for scalar differential equations (J.
Dyn. Diff. Eqns., 24/2012).

6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph