Minimal-support variance conjecture for planar point-mass measures

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.

Sources & referencesView supporting material

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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