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Answers for “在度量空间中,d(x,y)=0 对 x 和 y 意味着什么?”

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Distance is independent of direction because of the symmetry property of the metric. The formula d(x,y)=d(y,x)d(x,y) = d(y,x) shows that swapping the order of the points does not change the distance value.

Conditions: xx and yy are points in the metric space.