Zero-dimensional intersection conjecture for degree-\d hypersurfaces

Let κ\kappa be an algebraically closed field, and let Sd(m,κ)S_d(m,\kappa) be the degree-dd graded component of κ[x0,,xm]\kappa[x_0,\dots,x_m]. For mr(d+mm)m\leq r\leq \binom{d+m}{m}, define

ur(d,m):=max{V(W):WSd(m,κ), dim(W)=r, dim(V(W))=0}.u_r(d,m):=\max\{|V(W)|:W\subseteq S_d(m,\kappa),\ \dim(W)=r,\ \dim(V(W))=0\}.

Let

Ω(d,m):={(α1,α2,,αm+1)N0m+1:i=1m+1αi=d, d{α2,,αm}}.\Omega'(d,m):=\Big\{(\alpha_1,\alpha_2,\dots,\alpha_{m+1})\in\mathbb{N}_0^{m+1}:\sum_{i=1}^{m+1}\alpha_i=d,\ d\notin\{\alpha_2,\dots,\alpha_m\}\Big\}.

Order Ω(d,m)\Omega'(d,m) lexicographically, let ωr(d,m)\omega'_r(d,m) be its rrth largest element, and, if ωr(d,m)=(α1,,αm+1)\omega'_r(d,m)=(\alpha_1,\dots,\alpha_{m+1}), define

Hr(d,m):=α1dm1++αm.H'_r(d,m):=\alpha_1d^{m-1}+\dots+\alpha_m.

Zero-dimensional intersection conjecture. Given d,m1d,m\geq 1 and mr(d+mm)m\leq r\leq \binom{d+m}{m}, we have

ur(d,m)=Hr(m1)(d,m).u_r(d,m)=H'_{r-(m-1)}(d,m).

This conjecture proposes an exact formula for the largest possible cardinality of a zero-dimensional common vanishing set of an rr-dimensional space of degree-dd forms. The supplied text does not establish the conjecture or give evidence resolving it; its status is therefore open.

Sources & referencesView supporting material

Primary source

Yuxin Lin and Deepesh Singhal, “Largest zero-dimensional intersection of r degree d hypersurfaces”, arXiv:2507.05732 (2026).

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