Exercise 2.14: Demonstrate that Lem is right.
Investigate the behavior of the system on a variety of arithmetic
expressions. Make some intervals 
  A
 and 
  B
, and use them in computing the
expressions 
  
    A
    
      /
    
    A
  
 and 
  
    A
    
      /
    
    B
  
.  You will get the most insight by
using intervals whose width is a small percentage of the center value. Examine
the results of the computation in center-percent form (see Exercise 2.12).