Random Roth fusion lemma for generalized random rational functions

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Let K1K_1, K2K_2, and kk be random compact subsets of C\mathbb C with K1(ω)∩K2(ω)=∅K_1(\omega)\cap K_2(\omega)=\emptyset for every ω\omega. Assume

∣K1(Ω)∣+∣K2(Ω)∣+∣k(Ω)∣≤ℵ0.|K_1(\Omega)|+|K_2(\Omega)|+|k(\Omega)|\leq\aleph_0.

Let r1,r2:Ω×C→C‾r_1,r_2:\Omega\times\mathbb C\to\overline{\mathbb C} be generalized random rational functions, with ri(ω,⋅)r_i(\omega,\cdot) having no pole in Ki(ω)K_i(\omega) for i=1,2i=1,2. If there is a positive error function ε:Ω→R+\varepsilon:\Omega\to\mathbb R^+ such that

∥r1(ω,⋅)−r2(ω,⋅)∥k(ω)<ε(ω),\lVert r_1(\omega,\cdot)-r_2(\omega,\cdot)\rVert_{k(\omega)}<\varepsilon(\omega),

then there exists a generalized random rational function r:Ω×C→C‾r:\Omega\times\mathbb C\to\overline{\mathbb C} and a measurable positive function A:Ω→R+A:\Omega\to\mathbb R^+, depending solely on K1K_1 and K2K_2, such that

∥r(ω,⋅)−r1(ω,⋅)∥(K1∪k)(ω)<A(ω)ε(ω)\lVert r(\omega,\cdot)-r_1(\omega,\cdot)\rVert_{(K_1\cup k)(\omega)}<A(\omega)\varepsilon(\omega)

and

∥r(ω,⋅)−r2(ω,⋅)∥(K2∪k)(ω)<A(ω)ε(ω)\lVert r(\omega,\cdot)-r_2(\omega,\cdot)\rVert_{(K_2\cup k)(\omega)}<A(\omega)\varepsilon(\omega)

for all ω∈Ω\omega\in\Omega. Random Roth fusion conjecture. Under these hypotheses, the generalized random rational function rr and measurable positive function AA with the stated approximation bounds exist. The paper describes this as a random version of Roth's fusion lemma and states that it would follow directly from the random Runge conjecture above, which the paper does not prove.

References

Primary source

Simon St-Amant and Jérémie Turcotte, “Approximation by random complex polynomials and rational functions”, arXiv:1709.08240 (2017).

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