operator * method
Performs an interval multiplication.
[a, b] * [c, d] = [min(ac, ad, bc, bd), max(ac, ad, bc, bd)]
Implementation
Interval operator *(Interval i) {
if (this.isEmpty() || i.isEmpty()) return Interval.empty();
final num min = _min(
this.min * i.min, this.min * i.max, this.max * i.min, this.max * i.max);
final num max = _max(
this.min * i.min, this.min * i.max, this.max * i.min, this.max * i.max);
return Interval(min, max);
}