Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prescribed Scalar Curvature with Minimal Boundary Mean Curvature on
  $S^4_+$   This paper is devoted to the prescribed scalar curvature under minimal
boundary mean curvature on the standard four dimensional half sphere. Using
topological methods from the theory of critical points at infinity, we prove
some existence results. These methods were first introduced by A. Bahri.

26
The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat