Higher-dimensional doubly ruled incidence conjecture for algebraic curves

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Let Γ\Gamma be a set of LL irreducible algebraic curves in Cn\mathbb{C}^n, each of degree at most dd, and let P2(Γ)P_2(\Gamma) denote the set of points incident to at least two curves of Γ\Gamma. Higher-dimensional doubly ruled incidence conjecture for algebraic curves. Either

∣P2(Γ)∣≤C(d,n)Lnn−1,|P_2(\Gamma)|\leq C(d,n)L^{\frac{n}{n-1}},

or there exist an integer mm with 2≤m≤n−12\leq m\leq n-1 and an irreducible affine variety ZZ of dimension mm which is generically doubly ruled by algebraic curves of degree at most dd and contains at least Lm−1n−1L^{\frac{m-1}{n-1}} curves of Γ\Gamma. This is the curve analogue of the line conjecture and extends the proposed higher-dimensional incidence alternative beyond straight lines; the source presents it as a conjectural generalization, with no resolution supplied.

References

Primary source

Larry Guth, “Ruled surface theory and incidence geometry”, arXiv:1606.07682 (2016).

Additional references

2 papers in this index state this conjecture (2015–2016). The statement above is taken from the most recent of them; the others are arXiv:1512.05648.

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