An open interval, usually written as (2, 4) is any number between 2 and 4 but excluding the two end points. Another way of writing it is {x : 2 < x < 4}.
A closed interval includes both end points and a semi-open or semi-closed includes one but not both.
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Open interval does not include its end points while closed interval includes
an interval is a range, mostly used in bar graphs.(e.g.8-34)
Yes, if it is the closed interval. No, if it is the open interval.
depends on the branch of math, and the math function/relation you are talking about
How much is between two numbers.