Minimal-support variance conjecture for planar point-mass measures

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Let μ\mu be a finite point-mass probability measure on C\mathbb C. Let S(μ)S(\mu) be its finite support, let Smin⁡(μ)S_{\min}(\mu) consist of support points having minimal mass, and let V(μ)V(\mu) be the set of zeros of its Cauchy transform outside S(μ)S(\mu). Let hh denote the one-sided Hausdorff distance and let σ∞(μ)\sigma_\infty(\mu) be the Chebyshev radius of S(μ)S(\mu).

Minimal-support variance conjecture.

h(Smin⁡(μ),V(μ))≤σ∞(μ).h(S_{\min}(\mu),V(\mu))\leq\sigma_\infty(\mu).

The source notes that a related stronger claim fails for three-point measures and presents this restricted statement as one that still implies Sendov's conjecture. Its resolution is not given.

References

Primary source

Dmitry Khavinson, Rajesh Pereira, Mihai Putinar, Edward B. Saff and Serguei Shimorin, “Borcea's variance conjectures on the critical points of polynomials”, arXiv:1010.5167 (2011).

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