Problem 1.   Boas Problem #1, Ch.11.5, page 542. 

Problem 2.   Boas Problem #2, Ch.11.5, page 542.

Problem 3.   Boas Problem #4, Ch.11.5, page 542.

Problem 4.   Boas Problem #6, Ch.11.7, page 544.

Problem 5.   Boas Problem #7, Ch.11.7, page 544.

Problem 6.   Boas Problem #3, Ch.11.8, page 546.