Addendum to Uniqueness of certain polynomials constant on a line
arXiv:1302.1441
Abstract
The computer calculations in arXiv:0808.0284 to classify sharp polynomials with nonegative coefficients constant on the line have been extended to degrees 19 and 21. In degree 19 a surprisingly large number of 13 sharp polynomials was found, while in degree 21 only the group invariant polynomial exists.
Addendum to arXiv:0808.0284, 6 pages. Updated with degree 21 result