Definition 21.2.2 (Borel $\sigma$-Algebra on $\ol{\real}$).label The family
\[\cb_{\ol{\real}}= \bracsn{E \subset \ol \real| E \cap \real \in \cb_\real}\]
is the Borel $\sigma$-algebra on $\ol{\real}$.
Definition 21.2.2 (Borel $\sigma$-Algebra on $\ol{\real}$).label The family
is the Borel $\sigma$-algebra on $\ol{\real}$.
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