Question

define close interval​

Answer 1

$\huge\underline\green{Answer:-}$

A closed interval is an interval that includes all of its limit points. ... If one of the endpoints is , then the interval still contains all of its limit points (although not all of its endpoints), so and are also closed intervals, as is the interval .

Answer 2

A closed interval is that, which is an interval that includes all of its limit points.