Example 1.1
Example 1.2
Example 1.3
Example 1.4
Example 1.5 
Exercise 1.1
Exercise 1.2
Exercise 1.3
Exercise 1.4
Exercise 1.5
Exercise 1.6
Exercise 1.7
Exercise 1.8
Exercise 1.9
Exercise 1.10
Exercise 1.11
Exercise 1.12
Exercise 1.13
Exercise 1.14
Exercise 1.15
Exercise 1.16
Exercise 1.17
Exercise 1.18