Edel–Landjev–Xiang conjecture on the highest intersections with Hermitian surfaces

Let V2P3(Fq2)V_2\subset\mathbb{P}^3(\mathbb{F}_{q^2}) be a non-degenerate Hermitian surface, and let FFq2[x0,x1,x2,x3]F\in\mathbb{F}_{q^2}[x_0,x_1,x_2,x_3] be homogeneous of degree dd. Let wiw_i, for 1i2d+11\leq i\leq 2d+1, denote the 2d+12d+1 highest possible values of

V(F)V2.|V(F)\cap V_2|.

Edel–Landjev–Xiang conjecture. For each ii, there exist linear homogeneous polynomials H1,,HdH_1,\ldots,H_d such that the hyperplanes V(H1),,V(Hd)V(H_1),\ldots,V(H_d) contain a common line and

V(H1Hd)V2=wi.|V(H_1\cdots H_d)\cap V_2|=w_i.

The conjecture describes the extremal intersection values by unions of dd hyperplanes through a common line. It is stated here as a specialization of Conjecture 2(i) from the cited work, and no resolution is supplied in the text.

Sources & referencesView supporting material

Primary source

Peter Beelen and Mrinmoy Datta, “Maximum number of points on intersection of a cubic surface and a non-degenerate Hermitian surface”, arXiv:1802.06681 (2020).

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