We show that an ideal I on ω is meager if and only if the set of sequences (xn) taking values in a Polish space X for which all elements of X are I-cluster points of (xn) is comeager. The latter condition is also known as ν-maldistribution, where ν : P(ω) → R is the {0, 1}-valued submeasure defined by ν(A)=1 if and only if A /∈ I. It turns out that the meagerness of I is also equivalent to a technical condition given by Mišík and Tóth (2025) [19]. Lastly, we show that the analogue of the first part holds replacing ν with ·ϕ, where ϕ is a lower semicontinuous submeasure
On maldistributed sequences and meager ideals
Paolo Leonetti
2025-01-01
Abstract
We show that an ideal I on ω is meager if and only if the set of sequences (xn) taking values in a Polish space X for which all elements of X are I-cluster points of (xn) is comeager. The latter condition is also known as ν-maldistribution, where ν : P(ω) → R is the {0, 1}-valued submeasure defined by ν(A)=1 if and only if A /∈ I. It turns out that the meagerness of I is also equivalent to a technical condition given by Mišík and Tóth (2025) [19]. Lastly, we show that the analogue of the first part holds replacing ν with ·ϕ, where ϕ is a lower semicontinuous submeasure| File | Dimensione | Formato | |
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