An Operator Approach to the Al-Salam-Carlitz Polynomials

Details An Operator Approach to the Al-Salam-Carlitz Polynomials An Operator Approach to the Al-Salam-Carlitz Polynomials

2009-10-09

arxiv.org/abs/0910.1746v1

Mathematics

Classical Analysis and ODEs

15 pages

Scientific paper

We present an operator approach to Rogers-type formulas and Mehler's formulas for the Al-Salam-Carlitz polynomials $U_n(x,y,a;q)$. By using the q-exponential operator, we obtain a Rogers-type formula which leads to a linearization formula. With the aid of a bivariate augmentation operator, we get a simple derivation of Mehler's formula due to by Al-Salam and Carlitz, which requires a terminating condition on a ${}_3\phi_2$ series. By means of the Cauchy companion augmentation operator, we obtain Mehler's formula in a similar form, but it does not need the terminating condition. We also give several identities on the generating functions for products of the Al-Salam-Carlitz polynomials which are extensions of formulas for Rogers-Szeg\"o polynomials.

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