On Convergence Sets of Power Series with Holomorphic Coefficients
We consider convergence sets of formal power series of the form $f(z,t)=\sum_{n=0}^{\infty} f_n(z)t^n$, where $f_n(z)$ are holomorphic functions on a domain $Ω$ in $\mathbb{C}$. A subset $E$ of $Ω$ is said to be a convergence set in $Ω$ if there is a series $f(z,t)$ such that $E$ is exactly the set of points $z$ for which $f(z,t)$ converges as a power series in a single variable $t$ in some neighborhood of the origin. A $σ$-convex set is defined to be the union of a countable collection of polynomially convex compact subsets. We prove that a subset of $\mathbb{C}$ is a convergence set if and only if it is $σ$-convex.
math.CV↗