Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Joint Criterion for Reachability and Observability of Nonuniformly
  Sampled Discrete Systems   A joint characterization of reachability (controllability) and observability
(constructibility) for linear SISO nonuniformly sampled discrete systems is
presented. The work generalizes to the nonuniform sampling the criterion known
for the uniform sampling. Emphasis is on the nonuniform sampling sequence,
which is believed to be an additional element for analysis and handling of
discrete systems.

8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess