Let f be a real-valued function with dom(f) ⊆ R. Prove f is continuous at x0 if and only if, for every monotonic sequence (xn) in dom(f) converging to x0, we have lim f(xn) = f(x0).
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This means that for any ε > 0, there exists a δ > 0 such that if |x - x0| < δ, then |f(x) - f(x0)| < ε. ** Show more…
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