Multiplying intervals

### 5.40.5 Multiplying intervals

Intervals are multiplied by multiplying both end points of the first interval by both end points of the second interval. The smallest product will be the left end point of the product interval, and the largest product will be the right end point of the product interval.
Input:

i[1,4]*i[2,3]

Output:

[2.00000000000000..0.120000000000000e2]

Input:

i[-2,4]*i[3,5]

Output:

[-0.100000000000000e2..0.200000000000000e2]