Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sharp ill-posedness of the Dirac-Klein-Gordon system in one dimension   We show the ill-posedness of the Cauchy problem for the Dirac-Klein-Gordon
system in one dimension in the critical Sobolev space. From this, we finish the
classification of the regularities for which this problem is well-posed or
ill-posed.

26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th