Let A ⊆ R and p ∈ A. Suppose A\{p}6= ∅. Prove that p is an isolated point of A if and only if ...

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Let A ⊆ R and p ∈ A. Suppose A\{p}6= ∅. Prove that p is an isolated point of A if and only if ...

Let A ⊆ R and p ∈ A. Suppose A\{p}6= ∅. Prove that p is an isolated point of A if and only if d(p,A\{p}) > 0.

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