Solution 7.

See text and/or instructor's solution manual.

Answer.   This follows immediately from Property (5-4)  ,  if and only if  ,  for some integer  n.

Solution.   

                    

We are done.   

Remark.  Indeed, there is an relation     .

Aside.  We can let Mathematica double check our work.

This solution is complements of the authors.

(c) 2008 John H. Mathews, Russell W. Howell