Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A few remarks on quadratic harnesses   We analyze and partially solve system of recurrences that can be derived from
the properties of martingale orthogonal polynomials that characterize quadratic
harnesses (QH). We also specify conditions for the existence of moments of one
dimensional distribution for large classes of quadratic harnesses that are also
Markov processes complementing earlier results.

25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex