[Readings]

0. Read Chapter 4.1 (except 4.1.4) and 4.2 of the textbook.

[Exercises]

For each exercise, you must briefly explain your reasoning, i.e. not just giving the final result.

1.(12pt) Exercise 4.1

2.(6pt) Exercise 4.3 (a) and (b)

3.(9pt) Exercise 4.4

4.(10pt) Exercise 4.6

5.(5pt) Exercise 4.8

6.(+8pt extra credit) Exercise 4.3 (c) and (d)