Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Characterization of Wishart Processes and Wishart Distributions   A characterization of the existence of non-central Wishart distributions
(with shape and non-centrality parameter) as well as the existence of solutions
to Wishart stochastic differential equations (with initial data and drift
parameter) in terms of their exact parameter domains is given. These two
families are the natural extensions of the non-central chi-square distributions
and the squared Bessel processes to the positive semidefinite matrices.

21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
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The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat