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Bokuan Li
926305e65c Fixed typo.
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2026-08-29 15:43:23 -04:00
Bokuan Li
fab7bb7af4 Fixed citation entry for a stackexchange post.
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2026-08-28 15:06:30 -04:00
Bokuan Li
f165b4fd2d Added citation for the type 1 proof.
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4 changed files with 13 additions and 2 deletions

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@@ -283,3 +283,13 @@
volume = {2}, volume = {2},
year = {1951} year = {1951}
} }
@MISC {TownesType1,
title = {Classification of Type 1 factors},
author = {leslie townes},
howpublished = {Mathematics Stack Exchange},
note = {URL:https://math.stackexchange.com/q/150258 (version: 2012-05-27)},
eprint = {https://math.stackexchange.com/q/150258},
url = {https://math.stackexchange.com/q/150258}
}

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@@ -1,6 +1,7 @@
\section{Strongly Measurable Functions} \section{Strongly Measurable Functions}
\label{section:strongly-measurable} \label{section:strongly-measurable}
\begin{definition}[Strongly Measurable Function] \begin{definition}[Strongly Measurable Function]
\label{definition:strongly-measurable} \label{definition:strongly-measurable}
Let $(X, \cm)$ be a measurable space, $E$ be a normed vector space over $K \in \RC$, and $f: X \to E$, then the following are equivalent: Let $(X, \cm)$ be a measurable space, $E$ be a normed vector space over $K \in \RC$, and $f: X \to E$, then the following are equivalent:

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@@ -37,7 +37,7 @@
\label{proposition:convergence-in-measure} \label{proposition:convergence-in-measure}
Let $(X, \cm, \cf, \mu)$ be a \hyperref[scaffolded]{definition:measure-scaffold} measure space, $(Y, d)$ be a separable metric space, and $\fF$ be a filter of $(\cm, \cb_Y)$-measurable functions, then $\fF$ is Cauchy in measure if and only if: Let $(X, \cm, \cf, \mu)$ be a \hyperref[scaffolded]{definition:measure-scaffold} measure space, $(Y, d)$ be a separable metric space, and $\fF$ be a filter of $(\cm, \cb_Y)$-measurable functions, then $\fF$ is Cauchy in measure if and only if:
\begin{enumerate} \begin{enumerate}
\item[(L)] $\fF$ is \hyperref[definition:locally-in-measure]{definition:locally-in-measure}. \item[(L)] $\fF$ is Cauchy \hyperref[locally in measure]{definition:locally-in-measure}.
\item[(T)] For each $\eps, \delta > 0$, there exists $F \in \fF$ and $A \in \cf$ such that \item[(T)] For each $\eps, \delta > 0$, there exists $F \in \fF$ and $A \in \cf$ such that
\[ \[
\sup_{f, g \in F}\mu(A^c \cap \bracs{d(f, g) > \delta}) < \eps \sup_{f, g \in F}\mu(A^c \cap \bracs{d(f, g) > \delta}) < \eps

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@@ -234,7 +234,7 @@
\item There exists a complex Hilbert space $K$ and a *-isomorphism $\pi: A \to B(K)$. \item There exists a complex Hilbert space $K$ and a *-isomorphism $\pi: A \to B(K)$.
\end{enumerate} \end{enumerate}
\end{theorem} \end{theorem}
\begin{proof} \begin{proof}[Proof, {{\cite{TownesType1}}}. ]
(1) $\Rightarrow$ (2): Since $A$ is of type $\vnI$, $A$ admits a non-zero abelian projection $Q \in \text{Proj}(A)$. By \autoref{lemma:abelian-minimal-factor}, $Q$ is minimal. (1) $\Rightarrow$ (2): Since $A$ is of type $\vnI$, $A$ admits a non-zero abelian projection $Q \in \text{Proj}(A)$. By \autoref{lemma:abelian-minimal-factor}, $Q$ is minimal.
(2) $\Rightarrow$ (3): Let $P \in \text{Proj}(A)$ and $Q \in \text{Proj}(A)$ be a minimal projection. By the \hyperref[comparability theorem]{corollary:vna-factor-comparability}, either $P \preceq Q$ or $Q \preceq P$. (2) $\Rightarrow$ (3): Let $P \in \text{Proj}(A)$ and $Q \in \text{Proj}(A)$ be a minimal projection. By the \hyperref[comparability theorem]{corollary:vna-factor-comparability}, either $P \preceq Q$ or $Q \preceq P$.