Let x ∈ R. Recall that a neighborhood of x is an open interval of the sort (x – ε, x + ε), where ε > 0. We now define a neigh borhood of ∞ to be an open interval of the sort (a, ∞), where a ∈ R....


Let x ∈ R. Recall that a neighborhood of x is an open interval of the sort (x – ε, x + ε), where ε > 0. We now define a neigh borhood of ∞ to be an open interval of the sort (a, ∞), where a ∈ R. Suppose that f : D → R and let c and L be real numbers or ∞. If c ∈ R, we require c to be an accumulation point of D, and if c = ∞, we require D to be unbounded above. Define limx → c f (x) = L if for every neighborhood V of L there exists a neighborhood U of c such that f (x) ∈ V for all x ∈ U ∩ D with x ≠ c. (It should also agree with Exercise 13 when c ∈ R and L = ∞.)



May 05, 2022
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