AngouriMath
UniteIntervalAndInterval(AngouriMath.Entity.Set.Interval,AngouriMath.Entity.Set.Interval)
Method (no overloads)
Summary
The union of two intervals: one interval where they overlap or touch, and as written
where they do not, or where that cannot be told.
where they do not, or where that cannot be told.
Remarks
An empty interval adds nothing -- one whose left end is above its right, or at it with
an end open -- so[0; 1] \/ [1; 0] is [0; 1] . Two intervals that touch are
one only when neither is empty. Touching was tested first, so[1; 0] , touching
[0; 1] at 0, was joined to it into { 1 } , and [a; b] \/ [b; a] into
{ b } . Ends that are not numbers do not say whether an interval is empty, unless
the ends are one expression closed at both or one end is infinite, as in
(-oo; x] \/ [x; +oo) ; otherwise the union is left as written.
https://github.com/asc-community/AngouriMath/issues/1634
an end open -- so
one only when neither is empty. Touching was tested first, so
the ends are one expression closed at both or one end is infinite, as in
https://github.com/asc-community/AngouriMath/issues/1634
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