English

Universal Taylor Series in several variables depending on parameters

Complex Variables 2020-08-18 v1 Classical Analysis and ODEs Functional Analysis

Abstract

We establish generic existence of Universal Taylor Series on products Ω=Ωi\Omega = \prod \Omega_i of planar simply connected domains Ωi\Omega_i where the universal approximation holds on products KK of planar compact sets with connected complements provided KΩ=K \cap \Omega = \emptyset. These classes are with respect to one or several centers of expansion and the universal approximation is at the level of functions or at the level of all derivatives. Also, the universal functions can be smooth up to the boundary, provided that KΩ=K \cap \overline{\Omega} = \emptyset and {}[CΩi]\{\infty\} \cup [\mathbb{C} \setminus \overline{\Omega}_i] is connected for all ii. All previous kinds of universal series may depend on some parameters; then the approximable functions may depend on the same parameters, as it is shown in the present paper. These universalities are topologically and algebraically generic.

Keywords

Cite

@article{arxiv.2008.06984,
  title  = {Universal Taylor Series in several variables depending on parameters},
  author = {Giorgos Gavrilopoulos and Konstantinos Maronikolakis and Vassili Nestoridis},
  journal= {arXiv preprint arXiv:2008.06984},
  year   = {2020}
}

Comments

arXiv admin note: text overlap with arXiv:2008.03780

R2 v1 2026-06-23T17:53:29.319Z