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Let (x_n) from(n = 1 to ∞) be a sequence in R. Show that x ∈...

Let (x_n) from(n = 1 to ∞) be a sequence in R. Show that x ∈ R is an accumulation point of (x_n) from (n=1 to ∞) if and only if, for each ϵ > 0, there are infinitely many n ∈ N such that |x_n − x| < ϵ

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