Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Pfirsch-Tasso versus standard approaches in the plasma
  stability theory including the resistive wall effects" [Phys. Plasmas 24,
  112513 (2017)]   In the commended paper it is claimed that the proves of the
"Resitive-Wall-Mode theorem" by Pfirsch and Tasso [Nucl. Fusion \textbf{11},
259 (1971)] and extensions of that theorem for time dependent wall resistivity
and equilibrium plasma flow are not detailed and that there are limitations
restricting their applicability. In response, we provide here pertinent
detailed derivations showing that the proves of the above mentioned theorems
are rigorous and complete, unlike the considerations in the commended paper
which ignore the self adjointness of the operator $\nabla\times\nabla\times$
and the fact that the force operator in the linearized ideal MHD momentum
equation remains self adjoint in the presence of equilibrium flows. As a matter
of fact it is proved here that, because of the self adjointness of the operator
$\nabla\times\nabla\times$, a claimed in the commended paper additional term in
Ohm's law vanishes identically.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph