Zero-dimensional intersection conjecture for degree-\d hypersurfaces

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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 m≤r≤(d+mm)m\leq r\leq \binom{d+m}{m}, define

ur(d,m):=max⁡{∣V(W)∣:W⊆Sd(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):=α1dm−1+⋯+αm.H'_r(d,m):=\alpha_1d^{m-1}+\dots+\alpha_m.

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

ur(d,m)=Hr−(m−1)′(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.

References

Primary source

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

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