Existence of a function eliminating the asymptotic set when the bifurcation set is empty

Let G=(G1,,Gn1):CnCn1G=(G_1,\ldots,G_{n-1}):\mathbb{C}^n\to\mathbb{C}^{n-1} be a polynomial mapping with n3n\geq 3, and let B(G)B(G) denote its bifurcation set. For a function ρ\rho, let SG(ρ)\mathcal{S}_G(\rho) denote the associated set at infinity.

Existence conjecture. Does there exist a function ρ\rho such that

B(G)=SG(ρ)=?B(G)=\emptyset \quad\Longrightarrow\quad \mathcal{S}_G(\rho)=\emptyset?

The question asks whether an appropriate choice of the function ρ\rho can make the relevant set at infinity empty whenever the polynomial mapping has no bifurcation values. The surrounding discussion gives an example showing that the associated intersection homology behavior can depend on the choice of ρ\rho; the existence of such a function is left as a conjectural question.

Sources & referencesView supporting material

Primary source

Nguyen Thi Bich Thuy, “A remark on a polynomial mapping from ^n to ^n”, arXiv:1606.08799 (2016).

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