Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Boundary controllability for a degenerate and singular wave equation   In this paper, we deal with the boundary controllability of a one-dimensional
degenerate and singular wave equation with degeneracy and singularity occurring
at the boundary of the spatial domain. Exact boundary controllability is proved
in the range of subcritical/critical potentials and for sufficiently large
time, through a boundary controller acting away from the degenerate/singular
point. By duality argument, we reduce the problem to an observability estimate
for the corresponding adjoint system, which is proved by means of the
multiplier method and a new special Hardy-type inequality.

15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex