Question

Let set of real numbers {x: a < x < b} is called

Answer 1

Answer:

{all x are real number, a€b ab<x}

Answer 2

Answer:

Intervals as subsets of R Let a, b ∈ R and a < b. Then

(a) An open interval denoted by (a, b) is the set of real numbers {x : a < x < b}

(b) A closed interval denoted by [a, b] is the set of real numbers {x : a ≤ x ≤ b)

(c) Intervals closed at one end and open at the other are given by

(a, b) = {x : a ≤ x < b}

(a, b) = {x : a < x ≤ b}

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