Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonexistence of compressible irrotational inviscid flows along infinite
  protruding corners   We consider inviscid flow with isentropic coefficient greater than one. For
flow along smooth infinite protruding corners we attempt to impose a nonzero
limit for velocity at infinity at the upstream wall. We prove that the problem
does not have any irrotational uniformly subsonic solutions, whereas rotational
flows do exist. This can be considered a case of a slip-condition solid
"generating" vorticity in inviscid flow.

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The categories of this paper are: cs
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
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The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex