On square-free values of large polynomials over the rational function field

Abstract

We investigate the density of square-free values of polynomials with large coefficients over the rational function field ${\mathbb{F}}_q[t]$. Some interesting questions answered as special cases of our results include the density of square-free polynomials in short intervals, and an asymptotic for the number of representations of a large polynomial $N$ as a sum of a small $k$-th power and a square-free polynomial.

Appendix by Alexei Entin. 19 pages