Limit point

Let $X$ be a topological space; let $S$ be a subset of $X$ . An element $x$ of $X$ is called a limit point of $S$ if every neighborhood of $x$ contains some element of $S$ other than $x$ .

When $X$ is a metric space, it follows that every neighborhood of $x$ must contain infinitely many elements of $S$ other than $x$ . A point $x$ such that each neighborhood of $x$ contains uncountably many elements of $S$ is called a condensation point of $S$ .

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Limit point