Static approximate Gauss–Lucas conjecture for rational functions

Let KCK\subset\mathbb{C} be bounded and convex, and let ϵ>0\epsilon>0 be given. There is some constant C>0C>0 such that if k/(nk)>Ck/(n-k)>C, then KK satisfies RAGL(n,k,ϵ)\mathcal{RAGL}(n,k,\epsilon). Static approximate Gauss–Lucas conjecture. A sufficiently large ratio of zeros in KK to zeros and poles outside KK should guarantee the rational approximate Gauss–Lucas property for KK, with the threshold depending only on KK and ϵ\epsilon. This is proposed as a static principle underlying Totik's asymptotic approximate Gauss–Lucas theorem; its resolution is not given here.

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Primary source

Trevor Richards, “On approximate Gauss-Lucas theorems”, arXiv:1706.05410 (2017).

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