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The function d used to define a distance between two points in constructing a metric space, with the following properties:

d(x, y)=0 if and only if x=y,

d(x, y)=d(y, x),

d(x, y)+d(y, z)≥d(x, z) for any points x, y, z.

Subjects: Mathematics — Astronomy and Astrophysics.

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