In the literature, various types of points and meager sets whose complements are connected have been studied, such as colocally connected points, non-weak cut points/sets, non-block points/sets, shore points/sets, etc. We extend that study, in the following way: considering a continuum X and a natural number n, we investigate sets A ∈ 2X meeting the criterion that $X - A$ has at most n components, and we introduce degrees of connectivity of the complement of A. When $n=1$ and A is meager or singleton, these new definitions are equivalent to the known definitions of non-cut points/sets.
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Chacón-Tirado et al. (2024) studied this question.
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