Problems. Section 19: 1, 3, 7, 8, 26, 27. (6 Dec) Problem 13.35, 13.37. (8 Nov) Problems 13.21, 13.23, 13.31, 13.32, 13.33. (31 Oct) Problems 13.12, 13.13. (16 Oct) Problems 13.1, 13.2, 13.4, 13.5, 13.8. (11 Oct) Problems 7.8, 7.9, 7.20, 7.22. (25 Sep) Problem 7.18(a). (18 Sep) Problem 7.31. (1 Sep) Problems 7.6, 7.12, 7.13. (28 Aug) Problems 7.1, 7.2, 7.4. (23 Aug)