On real Waring decompositions of real binary forms

Abstract

The Waring Problem over polynomial rings asks how to decompose a homogeneous polynomial $p$ of degree $d$ as a finite sum of $d$-{th} powers of linear forms. In this work we give an algorithm to obtain a real Waring decomposition of any given real binary form $p$ of length at most its degree. In fact, we construct a semialgebraic family of Waring decompositions for $p$. Some examples are shown to highlight the difference between the real and the complex case.

21 pages; typos corrected

References in corpus (2)

• Real and complex rank for real symmetric tensors with low ranks
• On the Waring rank of binary forms: The binomial formula and a dihedral cover of rank two forms