Proposition 4
Tag 08QD, permanent. Cite it as [Bourbaki, Tag 08QD].
Integration, IV, p. 12, § 2. Negligible functions and sets
Every subset of a negligible set is negligible; every countable union of negligible sets is negligible.
This is an immediate consequence of Props. 1 and 2.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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