Intervals
(Excerpt from "The MathML Handbook" by Pavi Sandhu)
The interval element is used to represent intervals of real numbers. Here is an example of a closed interval:
[0, 1]
<interval>
<cn>0</cn>
<cn>1</cn>
</interval>
The interval element takes an attribute called closure, which specifies whether the interval is open or closed at each end. This attribute can take values that correspond to the four types of intervals: open, closed, open-closed, and closed-open. The default value is closed. Here is an example of an interval where the closure is specified explicitly:
[0, ∞)
<interval closure="closed-open">
<cn>0</cn>
<infinity/>
</interval>
One common use of the interval element is with the int element to specify the limits of a definite integral. Here is an example:
<apply>
<int/>
<bvar><ci>x</ci></bvar>
<interval>
<cn>0</cn>
<pi/>
</interval>
<apply>
<sin/>
<ci>x</ci>
</apply>
</apply>
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