Nodal singular locus conjecture for projected complete intersection curves

Let AZn+2A\in\mathbb Z^{n+2} be a finite set of full dimension containing 0Zn+20\in\mathbb Z^{n+2} and satisfying Assumption. For generic polynomials f1,,fn+1CAf_1,\ldots,f_{n+1}\in\mathbb C^{A}, let

C~=f1==fn+1=0(C0)n+2\widetilde{\mathcal C}=\\{f_1=\cdots=f_{n+1}=0\\}\subset (\mathbb C\setminus 0)^{n+2}

be the complete intersection curve, and let

π ⁣:(C0)n+2(C0)2\pi\colon(\mathbb C\setminus 0)^{n+2}\to(\mathbb C\setminus 0)^2

be the projection forgetting the first nn coordinates. Nodal singular locus conjecture. The image π(C~)\pi(\widetilde{\mathcal C}) is an algebraic plane curve with punctured points, and its singular locus consists only of nodes. This predicts that generic projected complete intersection curves have no singularities beyond ordinary double points, a property relevant to understanding the geometry and combinatorics of their plane projections; the conjecture is stated here as a further discussion and no resolution is supplied in the source.

Sources & referencesView supporting material

Primary source

Arina Voorhaar, “On the Singular Locus of a Plane Projection of a Complete Intersection”, arXiv:1910.06626 (2020).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.