intersection(RRi,RRi) -- computes intersection of input intervals

Synopsis

Function: intersection
Usage:

K = intersection(I,J)

K = intersection(I,J,Precision => prec)
Inputs:
- I, a real interval,
- J, a real interval,
Optional inputs:
- Precision => an integer, default value -1, specifies the desired precision of the output, a value of -1 uses the minimum precision of the inputs.
Outputs:
- K, a real interval,

Returns the intersection of the two input intervals or an empty interval if they do not intersect.