Petrakiev's conjecture on quadratic relations of points in symmetric position

Let ΓPe\Gamma\subseteq\mathbb{P}^{e} be a set of dd points in symmetric position. For nonnegative integers k,mk,m, say that Γ\Gamma satisfies the property \propa[k,m]\propa[k,m] if it is not contained in any variety YPeY\subseteq\mathbb{P}^{e} of dimension dimΓ+k\dim\Gamma+k with degYcodimY+m\deg Y\leq\operatorname{codim}Y+m. Petrakiev's conjecture. If 1me21\leq m\leq e-2, d2e+2m+1d\geq 2e+2m+1, and Γ\Gamma satisfies \propa[1,m]\propa[1,m], then

β1,1(Γ)(e2)+1m.\beta_{1,1}(\Gamma)\neq\binom{e}{2}+1-m.

The conjecture is presented as an algebraic counterpart to the Eisenbud–Harris genus conjecture, translating the geometric question into quadratic relations of finite sets of points; the source explicitly states that it remains open.

Sources & referencesView supporting material

Primary source

Jong In Han, Sijong Kwak and Wanseok Lee, “Hierarchical structure of graded Betti numbers in the quadratic strand”, arXiv:2512.14454 (2025).

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