1. Boas problem 12.2.3, page 567.

2. Boas problem 12.3.5, page 568.

3. Boas problem 12.4.3, page 569.

4. Boas problem 12.4.4, page 569.

5. Boas problems 12.5.3 & 12.5.4, pages 573–574.