Definition 17.3.2 (Radon Measure). Let $X$ be a LCH space and $\mu$ be a Borel signed/vector measure on $X$, then $\mu$ is Radon if $|\mu|$ is Radon.
Definition 17.3.2 (Radon Measure). Let $X$ be a LCH space and $\mu$ be a Borel signed/vector measure on $X$, then $\mu$ is Radon if $|\mu|$ is Radon.