Issue 11 (1990)
Total problems: 127 — Solved: 38, Partially solved: 12, Open: 77.
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The following problem numbers are missing from the official book: 11.41.
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
11.10
11.11
11.12
11.13
11.14
11.15
11.16
11.17
11.18
11.19
11.20
11.21
11.22
11.23
11.24
11.25
11.26
11.27
11.28
11.29
11.30
11.31
11.32
11.33
11.34
11.35
11.36
11.37
11.38
11.39
11.40
11.41 (missing)
11.42
11.43
11.44
11.45
11.46
11.47
11.48
11.49
11.50
11.51
11.52
11.53
11.54
11.55
11.56
11.57
11.58
11.59
11.60
11.61
11.62
11.63
11.64
11.65
11.66
11.67
11.68
11.69
11.70
11.71
11.72
11.73
11.74
11.75
11.76
11.77
11.78
11.79
11.80
11.81
11.82
11.83
11.84
11.85
11.86
11.87
11.88
11.89
11.90
11.91
11.92
11.93
11.94
11.95
11.96
11.97
11.98
11.99
11.100
11.101
11.102
11.103
11.104
11.105
11.106
11.107
11.108
11.109
11.110
11.111
11.112
11.113
11.114
11.115
11.116
11.117
11.118
11.119
11.120
11.121
11.122
11.123
11.124
11.125
11.126
11.127
11.128