Rational-function extension of the static approximate Gauss–Lucas conjecture

Let KCK\subset\mathbb{C} be convex, and let ϵ>0\epsilon>0 be given. There exists some constant C>0C>0 for which the following holds. Let g,hC(z)g,h\in\mathbb{C}(z) be rational functions, and assume that all zeros, poles, and critical points of gg lie in KK. Rational-function extension conjecture. If

#z(g,C)+#p(g,C)#z(h,C)+#p(h,C)>C,\frac{\#_z(g,\mathbb{C})+\#_p(g,\mathbb{C})}{\#_z(h,\mathbb{C})+\#_p(h,\mathbb{C})}>C,

then

#c(gh,Kϵ)#c(g,K).\#_c(gh,K_\epsilon)\geq\#_c(g,K).

This extends the preceding static principle to an unbounded convex set and rational functions, assuming that the zeros, poles, and critical points of gg already lie in KK. The supplied text presents it as an additional conjecture and gives no resolution.

Sources & referencesView supporting material

Primary source

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

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