diff --git a/src/measure/radon/c0.tex b/src/measure/radon/c0.tex index 9969d72..3f0f166 100644 --- a/src/measure/radon/c0.tex +++ b/src/measure/radon/c0.tex @@ -169,5 +169,19 @@ \end{proof} +\begin{remark} +\label{remark:singer-representation} + In the proof of \hyperref[Singer's Representation Theorem]{theorem:singer-representation}, the $E^*$-valued measure is constructed pointwise as + \[ + \nu: \cb_X \to E^* \quad \dpn{y,\nu(A)}{E} = \int_{X \times B} \one_A(x) \cdot \dpn{y, \phi}{E} \mu(dx, d\phi) + \] + + It may be more tempting to use the strong formulation directly + \[ + \nu: \cb_X \to E^* \quad \dpn{y,\nu(A)}{E} = \int_{X \times B} \phi \cdot \one_A(x) \mu(dx, d\phi) + \] + + However, without additional assumptions on $E^*$, $\phi \cdot \one_A(x)$ may not be strongly measurable, which prevents this direct use of the Bochner integral. Thus the weak formulation is a necessary complication in the proof. +\end{remark}