Build the relative complement of interval B in interval A.
Accuracy: The result is a tight enclosure.
x = infsup (1, 3); y = infsup (2, 4); setdiff (x, y) ⇒ ans = [1, 2]
See also: @infsup/intersect, @infsup/union, @infsup/setxor.
Package: interval