Is this an outer measure? - Countable / uncountable | Measure Theory

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We practice proving that a function is an outer measure. It is defined as 0 if the set is countable and 1 if the set is uncountable.

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Timestamps in this video:

00:00 Introduction.
00:32 Definition of the function.
00:59 The measure of ∅ is 0.
01:25 Monotonicity.
4:55 Countable subadditivity.

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