On Lehmer's Conjecture for Polynomials and for Elliptic Curves

Abstract

A number of authors have proven explicit versions of Lehmer's conjecture for polynomials whose coefficients are all congruent to 1 modulo m. We prove a similar result for polynomials f(X) that are divisible in (Z/mZ)[X] by a polynomial of the form 1+X+...+X^n for some n > \epsilon*deg(f). We also formulate and prove an analogous statement for elliptic curves.