Define an open interval.

1.	Define an open interval.
Answer» If a, b ∈ R and a < b, then the set of all real numbers between a and b not including a and b is called an open interval. It is denoted by (a, b). Thus, (a, b) = {x\|a < x < b, x ∈ R}.

Answer»

If a, b ∈ R and a < b, then the set of all real numbers between a and b not including a and b is called an open interval. It is denoted by (a, b).

Thus, (a, b) = {x|a < x < b, x ∈ R}.

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