Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A characterization of normality via convex likelihood ratios   This work includes a new characterization of the multivariate normal
distribution. In particular, it is shown that a positive density function $f$
is Gaussian if and only if the $f(x+ y)/f(x)$ is convex in $x$ for every $y$.
This result has implications to recent research regarding inadmissibility of a
test studied by Moran~(1973).

6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex