Incremental update.

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Bokuan Li
2026-01-19 21:21:11 -05:00
parent 307f23ad57
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\label{proposition:rs-complete}
Let $[a, b] \subset \real$, $E_1, E_2, H$ be locally convex spaces, and $E_1 \times E_2 \to H$ with $(x, y) \mapsto xy$ be a continuous bilinear map, and $G \in BV([a, b]; E_2)$.
For each continuous seminorm $\rho$ on $H$ and $f: [a, b] \to E$, define
For each continuous seminorm $\rho$ on $E_1$ and $f: [a, b] \to E_1$, define
\[
[f]_{u, \rho} = \sup_{x \in [a, b]}f(\rho)
[f]_{u, \rho} = \sup_{x \in [a, b]}\rho(f(x))
\]
Let $\net{f} \subset RS([a, b], G)$ such that:
\begin{enumerate}
\item[(a)] $\rho(f_\alpha - f) \to 0$ for all continuous seminorm $\rho$ on $E_1$.
\item[(a)] For each continuous seminorm $\rho$ on $E_1$, $[f_\alpha - f]_{u, \rho} \to 0$.
\item[(b)] $\lim_{\alpha \in A}\int_a^b f_\alpha dG$ exists.
\end{enumerate}
then $f \in RS([a, b], G)$ and $\int_a^b f dG = \lim_{\alpha \in A}\int_a^b f_\alpha dG$. In particular,
\begin{enumerate}
\item If $H$ is complete, then condition (a) may be omitted.
\item If $H$ is complete, then condition (b) may be omitted.
\item If $H$ is sequentially complete and $A = \nat^+$, then condition (b) may be omitted.
\end{enumerate}
\end{proposition}