Aliev–Smyth's conjecture on isolated torsion points and Newton polytopes

Let fC[X1,,Xn]f\in\mathbb{C}[X_1,\ldots,X_n], let Z(f)GmnZ(f)\subset\mathbb{G}_{\mathrm{m}}^n be its zero set, and let Δ\Delta be the Newton polytope of ff. An isolated torsion point of Z(f)Z(f) is a torsion point that is isolated in this zero set. Aliev–Smyth's conjecture. The number of isolated torsion points on Z(f)Z(f) is bounded by cnvoln(Δ)c_n\operatorname{vol}_n(\Delta), where cnc_n is a constant depending only on nn. This strengthens Ruppert's multidegree bound by replacing the product of the multidegrees with the volume of the Newton polytope; the source presents it as an open conjecture.

Sources & referencesView supporting material

Primary source

César Martínez, “The number of maximal torsion cosets in subvarieties of tori”, arXiv:1509.05898 (2015).

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