Centuries: 9th century - 10th century - 11th century
Decades: 930s - 940s - 950s - 960s - 970s - 980s - 990s - 1000s - 1010s - 1020s - 1030s
Years: 980 981 982 983 984 985 986 987 988 989
... the distance between two points (x1, ..., xn) and (y1, ...,yn) to be the square root of Σ (xi-yi)2, where the sum is over i = 1, ..., n. This distance function i ...
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