Issue 12 (1992)
Total problems: 98 — Solved: 39, Partially solved: 1, Open: 58.
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The following problem numbers are missing from the official book: 12.18, 12.61, 12.83, 12.99.
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
12.10
12.11
12.12
12.13
12.14
12.15
12.16
12.17
12.18 (missing)
12.19
12.20
12.21
12.22
12.23
12.24
12.25
12.26
12.27
12.28
12.29
12.30
12.31
12.32
12.33
12.34
12.35
12.36
12.37
12.38
12.39
12.40
12.41
12.42
12.43
12.44
12.45
12.46
12.47
12.48
12.49
12.50
12.51
12.52
12.53
12.54
12.55
12.56
12.57
12.58
12.59
12.60
12.61 (missing)
12.62
12.63
12.64
12.65
12.66
12.67
12.68
12.69
12.70
12.71
12.72
12.73
12.74
12.75
12.76
12.77
12.78
12.79
12.80
12.81
12.82
12.83 (missing)
12.84
12.85
12.86
12.87
12.88
12.89
12.90
12.91
12.92
12.93
12.94
12.95
12.96
12.97
12.98
12.99 (missing)
12.100
12.101
12.102