# Expressible sets

Jaroslav Hancl
(University of Ostrava)
Analyseseminar
Torsdag, 23 november, 2017, at 16:15-17:15, in Aud. D3 (1531-215)
Abstrakt:
Let $A=\{a_n\}_{n=1}^\infty$ be a  sequence of positive reals. In the spirit of the Erdös we  say that $E_A=\{ \sum_{n=1}^\infty \frac 1{c_na_n}; c_n \ \mbox {is a positive integer}\}$ is an expressible set of the sequence $A$. We study certain properties of such kind of sets.

Kontaktperson: Simon Kristensen