Issue 4 (1973)
Total problems: 73 — Solved: 45, Partially solved: 4, Open: 24.
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The following problem numbers are missing from the official book: 4.15, 4.25, 4.26, 4.43.
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15 (missing)
4.16
4.17
4.18
4.19
4.20
4.21
4.22
4.23
4.24
4.25 (missing)
4.26 (missing)
4.27
4.28
4.29
4.30
4.31
4.32
4.33
4.34
4.35
4.36
4.37
4.38
4.39
4.40
4.41
4.42
4.43 (missing)
4.44
4.45
4.46
4.47
4.48
4.49
4.50
4.51
4.52
4.53
4.54
4.55
4.56
4.57
4.58
4.59
4.60
4.61
4.62
4.63
4.64
4.65
4.66
4.67
4.68
4.69
4.70
4.71
4.72
4.73
4.74
4.75
4.76
4.77