Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fractional Klein-Gordon equation with singular mass   We consider a space-fractional wave equation with a singular mass term
depending on the position and prove that it is very weak well-posed. The
uniqueness is proved in some appropriate sense. Moreover, we prove the
consistency of the very weak solution with classical solutions when they exist.
In order to study the behaviour of the very weak solution near the
singularities of the coefficient, some numerical experiments are conducted
where the appearance of a wall effect for the singular masses of the strength
of $\delta^2$ is observed.

27
The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
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The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics