Luca Chiantini
Published 2022-08-17Version 1
In the space of sextic forms in 4 variables with a decomposition of length 18 we determine and describe a closed subvariety which contains all non-identifiable sextics. The description of the subvariety is geometric, but one can derive from that an algorithm which can guarantee that a given form is identifiable.
A footnote to a footnote to a paper of B. Segre
Generalized identifiability of sums of squares
Decomposition in Coxeter-chambers of the configuration space of $d$ marked points on the complex plane
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