Metric outer measure
In mathematics, a metric outer measure is an outer measure μ defined on the subsets of a given metric space (X, d) such that
![\mu (A \cup B) = \mu (A) + \mu (B)](/Images/godic/202501/27/cd1d09578c51106352fc44d67184a5534926.png")
for every pair of positively separated subsets A and B of X.
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