The ED-degree stabilization conjecture for hypersurface Segre products

Let V1V_1 and V2V_2 be complex vector spaces, let Q1P(V1)Q_1\subset\mathbb{P}(V_1) be the isotropic quadric, and let XP(V1)X\subset\mathbb{P}(V_1) be a projective hypersurface such that XQ1X\cap Q_1 is reduced. For a general subspace LjP(V1)L_j\subset\mathbb{P}(V_1) of codimension jj, consider the Segre product X×P(V2)X\times\mathbb{P}(V_2).

ED-degree stabilization conjecture.

EDdegreeF(X×P(V2))=j=0n11EDdegreeF(XLj).\operatorname{EDdegree}_F(X\times\mathbb{P}(V_2))=\sum_{j=0}^{n_1-1}\operatorname{EDdegree}_F(X\cap L_j).

Here n1n_1 is the projective dimension parameter used for P(V1)\mathbb{P}(V_1). This is presented as a conjectural generalization suggested by experiments in Macaulay2; the asserted formula remains open.

Sources & referencesView supporting material

Primary source

Giorgio Ottaviani, Luca Sodomaco and Emuanuele Ventura, “Asymptotics of degrees and ED degrees of Segre products”, arXiv:2008.11670 (2021).

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