{ "id": "math/0602440", "version": "v2", "published": "2006-02-20T18:28:50.000Z", "updated": "2007-01-09T17:59:53.000Z", "title": "Completeness, special functions and uncertainty principles over q-linear grids", "authors": [ "Luis Daniel Abreu" ], "comment": "15 pages, final version (first and second introductory paragraphs switched, an easier proof of the last theorem)", "journal": "J. Phys. A: Math. Gen. 39 (2006) 14567-14580", "doi": "10.1088/0305-4470/39/47/004", "categories": [ "math.CA", "math-ph", "math.MP" ], "abstract": "We derive completeness criteria for sequences of functions of the form $% f(x\\lambda_{n})$, where $\\lambda_{n}$ is the $nth$ zero of a suitably chosen entire function. Using these criteria, we construct systems of nonorthogonal Fourier-Bessel functions and their $q$-analogues, as well as other complete sets of $q$-special functions. The completeness of certain sets of $q$-Bessel functions is then used to prove that, if a function $f$ and its $q$-Hankel transform both vanish at the points $\\{q^{-n}\\}_{n=1}^{% \\infty}$, $0