Fujimoto's polynomial general-position conjecture for even integers

From papers

Let m2m\geq 2 be an even integer, and set tm2t\coloneqq \frac{m}{2}. Consider the following 3t3t polynomials:

fi(z)zi1(1it),fi(z)(z1)i1(t+1i2t),fi(z)zit1(z1)mi+t(2t+1i3t).\begin{aligned} &f_i(z)\coloneqq z^{i-1} &&(1\leq i\leq t),\\ &f_i(z)\coloneqq (z-1)^{i-1} &&(t+1\leq i\leq 2t),\\ &f_i(z)\coloneqq z^{i-t-1}(z-1)^{m-i+t} &&(2t+1\leq i\leq 3t). \end{aligned}

Fujimoto conjecture. These polynomials are in general position: any mm polynomials chosen from them are linearly independent over C\mathbb{C}. This conjecture is the algebraic ingredient underlying constructions showing that the bound m(m+1)2\frac{m(m+1)}{2} for omitted hyperplanes is best possible in the even-dimensional cases; the paper proves it through total positivity, thereby completing the corresponding best-possible examples for all even integers m4m\geq 4.

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Sources & referencesView supporting material

Primary source

Shuhei Katsuta, “The Fujimoto Conjecture via Total Positivity”, arXiv:2605.26258 (2026).

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