Category:Null Sets Closed under Countable Union

This category contains pages concerning Null Sets Closed under Countable Union:

Let $\struct {X, \Sigma, \mu}$ be a measure space.

Let $\sequence {N_n}_{n \mathop \in \N}$ be a sequence of $\mu$-null sets.

Then $N := \ds \bigcup_{n \mathop \in \N} N_n$ is also a $\mu$-null set.