Homework # 4,     Due BEFORE class on Friday, February 13th 


Look at problems 5.1-5.4.  The answers are in your text and these make
very good test or quiz problems.  I normally have a section of this 
type of problem on the first exam.   Do not hand these in, but I would
STRONGLY encourage you to work them.

Hand in:

Bring to class on Friday your  written solution to problems:

5.5
5.6  (prove this algebraicly, not by perfect induction)
5.7