Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carleman Estimates and null controllability of coupled degenerate
  systems   In this paper, we study the null controllability of weakly degenerate coupled
parabolic systems with two different diffusion coefficients and one control
force. To obtain this aim, we develop first new global Carleman estimates for
degenerate parabolic equations with weight functions different from the ones in
the previous works.

16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ