The Baire Category of Subsequences and Permutations which preserve Limit Points
Abstract
Let be a meager ideal on . We show that if is a sequence with values in a separable metric space then the set of subsequences [resp. permutations] of which preserve the set of -cluster points of is topologically large if and only if every ordinary limit point of is also an -cluster point of . The analogue statement fails for all maximal ideals. This extends the main results in [Topology Appl. \textbf{263} (2019), 221--229]. As an application, if is a sequence with values in a first countable compact space which is -convergent to , then the set of subsequences [resp. permutations] which are -convergent to is topologically large if and only if is convergent to in the ordinary sense. Analogous results hold for -limit points, provided is an analytic P-ideal.
Cite
@article{arxiv.2001.09357,
title = {The Baire Category of Subsequences and Permutations which preserve Limit Points},
author = {Marek Balcerzak and Paolo Leonetti},
journal= {arXiv preprint arXiv:2001.09357},
year = {2020}
}