Generic power series on subsets of the unit disk

Balázs Maga; Péter Maga

Czechoslovak Mathematical Journal (2022)

  • Volume: 72, Issue: 3, page 637-652
  • ISSN: 0011-4642

Abstract

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We examine the boundary behaviour of the generic power series f with coefficients chosen from a fixed bounded set Λ in the sense of Baire category. Notably, we prove that for any open subset U of the unit disk D with a nonreal boundary point on the unit circle, f ( U ) is a dense set of . As it is demonstrated, this conclusion does not necessarily hold for arbitrary open sets accumulating to the unit circle. To complement these results, a characterization of coefficient sets having this property is given.

How to cite

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Maga, Balázs, and Maga, Péter. "Generic power series on subsets of the unit disk." Czechoslovak Mathematical Journal 72.3 (2022): 637-652. <http://eudml.org/doc/298425>.

@article{Maga2022,
abstract = {We examine the boundary behaviour of the generic power series $f$ with coefficients chosen from a fixed bounded set $\Lambda $ in the sense of Baire category. Notably, we prove that for any open subset $U$ of the unit disk $D$ with a nonreal boundary point on the unit circle, $f(U)$ is a dense set of $\mathbb \{C\}$. As it is demonstrated, this conclusion does not necessarily hold for arbitrary open sets accumulating to the unit circle. To complement these results, a characterization of coefficient sets having this property is given.},
author = {Maga, Balázs, Maga, Péter},
journal = {Czechoslovak Mathematical Journal},
keywords = {complex power series; boundary behaviour; Baire category},
language = {eng},
number = {3},
pages = {637-652},
publisher = {Institute of Mathematics, Academy of Sciences of the Czech Republic},
title = {Generic power series on subsets of the unit disk},
url = {http://eudml.org/doc/298425},
volume = {72},
year = {2022},
}

TY - JOUR
AU - Maga, Balázs
AU - Maga, Péter
TI - Generic power series on subsets of the unit disk
JO - Czechoslovak Mathematical Journal
PY - 2022
PB - Institute of Mathematics, Academy of Sciences of the Czech Republic
VL - 72
IS - 3
SP - 637
EP - 652
AB - We examine the boundary behaviour of the generic power series $f$ with coefficients chosen from a fixed bounded set $\Lambda $ in the sense of Baire category. Notably, we prove that for any open subset $U$ of the unit disk $D$ with a nonreal boundary point on the unit circle, $f(U)$ is a dense set of $\mathbb {C}$. As it is demonstrated, this conclusion does not necessarily hold for arbitrary open sets accumulating to the unit circle. To complement these results, a characterization of coefficient sets having this property is given.
LA - eng
KW - complex power series; boundary behaviour; Baire category
UR - http://eudml.org/doc/298425
ER -

References

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  1. Bolyai János Mathematical Society: Miklós Schweitzer Memorial Competition 2020, Problems and Solutions, Available at https://www.bolyai.hu/files/Schweitzer2020megoldasok.pdf Hungarian. MR1162554
  2. Breuer, J., Simon, B., 10.1016/j.aim.2010.12.019, Adv. Math. 226 (2011), 4902-4920. (2011) Zbl1219.30001MR2775889DOI10.1016/j.aim.2010.12.019
  3. Kahane, J.-P., Some Random Series of Functions, Cambridge Studies in Advanced Mathematics 5. Cambridge University Press, Cambridge (1985). (1985) Zbl0571.60002MR0833073
  4. Kahane, J.-P., 10.1007/BF02791536, J. Anal. Math. 80 (2000), 143-182. (2000) Zbl0961.42001MR1771526DOI10.1007/BF02791536
  5. Kierst, S., Szpilrajn, E., 10.4064/FM-21-1-276-294, Fundam. Math. French 21 (1933), 276-294. (1933) Zbl0008.07401DOI10.4064/FM-21-1-276-294
  6. Kuratowski, K., 10.1016/C2013-0-11022-7, Academic Press, New York (1966). (1966) Zbl0158.40802MR0217751DOI10.1016/C2013-0-11022-7
  7. Maga, B., Maga, P., 10.5486/PMD.2018.8130, Publ. Math. 93 (2018), 413-424. (2018) Zbl1424.60048MR3875344DOI10.5486/PMD.2018.8130

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