Frobenius minimal ED-degree conjecture for Segre-Veronese varieties

Let VV be a vector space, let d\mathbf{d} and n\mathbf{n} denote the multi-indices defining the Segre-Veronese variety, and consider

Vd,nP(SdV).\mathcal{V}_{\mathbf{d},\mathbf{n}}\subset\mathbb{P}(S^{\mathbf{d}}V).

Let QFQ_F be a Frobenius inner product on SdVRS^{\mathbf{d}}V^{\mathbb{R}}, and let QQ be any positive definite symmetric bilinear form on SdVRS^{\mathbf{d}}V^{\mathbb{R}}. The ED degree with respect to a metric QQ is denoted by EDdegreeQ\operatorname{EDdegree}_Q, and the generic ED degree by gEDdegree\operatorname{gEDdegree}.

Frobenius minimal ED-degree conjecture. One has

EDdegreeQ(Vd,n)EDdegreeQF(Vd,n).\operatorname{EDdegree}_Q(\mathcal{V}_{\mathbf{d},\mathbf{n}})\geq\operatorname{EDdegree}_{Q_F}(\mathcal{V}_{\mathbf{d},\mathbf{n}}).

Equivalently, the maximum defect of ED degree of Vd,n\mathcal{V}_{\mathbf{d},\mathbf{n}} is

gEDdegree(Vd,n)EDdegreeQF(Vd,n).\operatorname{gEDdegree}(\mathcal{V}_{\mathbf{d},\mathbf{n}})-\operatorname{EDdegree}_{Q_F}(\mathcal{V}_{\mathbf{d},\mathbf{n}}).

This conjecture is the general claim motivating the paper. The examples preceding it show that the generic ED degree can grow with the format while the Frobenius ED degree can remain smaller; no resolution is given in the supplied text.

Sources & referencesView supporting material

Primary source

Khazhgali Kozhasov, Alan Muniz, Yang Qi and Luca Sodomaco, “On the minimal algebraic complexity of the rank-one approximation problem for general inner products”, arXiv:2309.15105 (2025).

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