A Unified Approach to Polynomial Sequences with
Only Real Zeros

Lily L. Liu and Yi Wang
Department of Applied Mathematics, University of Technology, Dalian 116024, P. R. China


Abstract     Full Text  PDF

We give new sufficient conditions for a sequence of polynomials to have only real zeros based on the method of interlacing zeros. As applications we derive several well-known facts, including the reality of zeros of orthogonal polynomials, matching polynomials, Narayana polynomials and Eulerian polynomials. We also settle certain conjectures of Stahl on genus polynomials by proving them for certain classes of graphs, while showing that they are false in general.