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[0QN] Given \(A⊆ X\), a point \(x∈ X\) is an accumulation point for \(A\) if, for every \(r{\gt}0\), \(B(x,r)∩ A⧵\{ x\} \) is not empty.
[0QN] Given \(A⊆ X\), a point \(x∈ X\) is an accumulation point for \(A\) if, for every \(r{\gt}0\), \(B(x,r)∩ A⧵\{ x\} \) is not empty.