See also
Carathéodory Extension, Carathéodory Measure, Countable Monotonicity, Measurable Set, Measurable Space, Measure, Measure Space, Premeasure
This entry contributed by Christopher Stover
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References
Royden, H. L. and Fitzpatrick, P. M. Real Analysis. Pearson, 2010.
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Cite this as:
Stover, Christopher. "Outer Measure." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/OuterMeasure.html