Special nonuniform 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.