Polynomially Interpolated Legendre Multiplier Sequences

Abstract

We prove that every multiplier sequence for the Legendre basis which can be interpolated by a polynomial has the form $\{h(k^2+k){\}}_{k=0}^{\infty }$, where $h\in \mathbb{R}[x]$. We also prove that a non-trivial collection of polynomials of a certain form interpolate multiplier sequences for the Legendre basis, and we state conjectures on how to extend these results.

14 pages, 2 figures