Issue 9 (1984)
Total problems: 81 — Solved: 33, Partially solved: 5, Open: 43.
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The following problem numbers are missing from the official book: 9.20, 9.22, 9.70.
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
9.11
9.12
9.13
9.14
9.15
9.16
9.17
9.18
9.19
9.20 (missing)
9.21
9.22 (missing)
9.23
9.24
9.25
9.26
9.27
9.28
9.29
9.30
9.31
9.32
9.33
9.34
9.35
9.36
9.37
9.38
9.39
9.40
9.41
9.42
9.43
9.44
9.45
9.46
9.47
9.48
9.49
9.50
9.51
9.52
9.53
9.54
9.55
9.56
9.57
9.58
9.59
9.60
9.61
9.62
9.63
9.64
9.65
9.66
9.67
9.68
9.69
9.70 (missing)
9.71
9.72
9.73
9.74
9.75
9.76
9.77
9.78
9.79
9.80
9.81
9.82
9.83
9.84