Abstract
Let and Hn(x) be the nth Laguerre and Hermite polynomials, respectively. Two well-known bilinear generating formulas are the Hardy-Hille formula [1, p. 101]and the mehler formula [1, p. 377]This suggests the following problem. Consider the equationwhere fa(x) is a polynomial in x of degree n with highest coefficient equal to 1,A0 = B0 = 1. We shall also assume that ak = 1 and y0y1y2 … yk–1 ≠ 0. We seek all sets of polynomials {fn(x)} which satisfy (1.3), (1.4) and (1.5).
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