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Expressible sets

Jaroslav Hancl
(University of Ostrava)
Analysis Seminar
Thursday, 23 November, 2017, at 16:15-17:15, in Aud. D3 (1531-215)
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. 

Contact person: Simon Kristensen