Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On mutually inverse transforms of functions on a half-line   Two transforms of functions on a half-line are considered. It is proved that
their composition gives a concave majorant for every nonnegative function. In
particular, this composition is the identity transform on the class of
nonnegative concave functions. Applications of this result to some problems of
mathematical physics are indicated. Several open questions are formulated.

26
The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga