Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A fractional representation approach to the robust regulation problem
  for SISO systems   The purpose of this article is to develop a new approach to the robust
regulation problem for plants which do not necessarily admit coprime
factorizations. The approach is purely algebraic and allows us dealing with a
very general class of systems in a unique simple framework. We formulate the
famous internal model principle in a form suitable for plants defined by
fractional representations which are not necessarily coprime factorizations. By
using the internal model principle, we are able to give necessary and
sufficient solvability conditions for the robust regulation problem and to
parameterize all robustly regulating controllers.

30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat