Exercises to be solved in ¡­

Exercises to be solved in the weeks to come: 2.2.1 (page 55): ex. 1, ex. 4. 2.4.3 (page 62): ex. 4, ex. 5, ex. 6. 2.7.1 (page 76): ex. 4, ex. 5, ex. 6, ex. 7.