Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Special non uniform lattice ($snul$) orthogonal polynomials on discrete
  dense sets of points.   Difference calculus compatible with polynomials (i.e., such that the divided
difference operator of first order applied to any polynomial must yield a
polynomial of lower degree) can only be made on special lattices well known in
contemporary $q-$calculus. Orthogonal polynomials satisfying difference
relations on such lattices are presented. In particular, lattices which are
dense on intervals ($|q|=1$) are considered.

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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics