Multiplier reciprocal conjecture for Banach spaces of holomorphic functions

From papers

Let Ω\Omega be a domain, let B(Ω)B(\Omega) be a Banach space of holomorphic functions on Ω\Omega, and let M(B(Ω))\mathcal{M}(B(\Omega)) denote its algebra of multipliers. Multiplier reciprocal conjecture. If ψM(B(Ω))\psi\in\mathcal{M}(B(\Omega)) and there exists a constant c>0c>0 such that

ψ(z)c|\psi(z)|\geq c

for all zΩz\in\Omega, then 1/ψB(Ω)1/\psi\in B(\Omega). This weaker conjecture is motivated by the known corresponding result for multipliers of the weighted Bergman space Aα2A^2_\alpha. The general Banach-space case remains open in the source.

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Primary source

Guangfu Cao, Li He and Ji Li, “Evaluation functions and composition operators on Banach spaces of holomorphic functions”, arXiv:2211.12236 (2023).

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