Definition:Limit Point of Set/Definition from Relative Complement

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Definition

Let $T = \struct {S, \tau}$ be a topological space.

Let $A \subseteq S$.


A point $x \in S$ is a limit point of $A$ if and only if $\paren {S \setminus A} \cup \set x$ is not a neighborhood of $x$.


Also see


Sources