5.40.8 The union of intervals: union
The union operator is an infixed operator.
union takes two intervals and returns their convex hull.
Input:
i[1,3] union i[2,4]
Output:
[1.00000000000000..4.00000000000000]
Input:
i[2,4] union i[6,9]
Output:
[2.00000000000000..9.00000000000000]