We prove that the smallest degree of an apolar 0-dimensional scheme of a general cubic form in n + 1 variables is at most 2n + 2, when n >= 8, and therefore smaller than the rank of the form. For the general reducible cubic form the smallest degree of an apolar subscheme is n + 2, while the rank is at least 2n.
Alessandra Bernardi, Kristian Ranestad (2013). On the cactus rank of cubic forms. JOURNAL OF SYMBOLIC COMPUTATION, 50, 291-297 [10.1016/j.jsc.2012.08.001].
On the cactus rank of cubic forms
BERNARDI, ALESSANDRA;
2013
Abstract
We prove that the smallest degree of an apolar 0-dimensional scheme of a general cubic form in n + 1 variables is at most 2n + 2, when n >= 8, and therefore smaller than the rank of the form. For the general reducible cubic form the smallest degree of an apolar subscheme is n + 2, while the rank is at least 2n.File in questo prodotto:
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