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refs.bib
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refs.bib
@@ -283,3 +283,13 @@
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volume = {2},
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volume = {2},
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year = {1951}
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year = {1951}
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}
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}
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@MISC {TownesType1,
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title = {Classification of Type 1 factors},
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author = {leslie townes},
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howpublished = {Mathematics Stack Exchange},
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note = {URL:https://math.stackexchange.com/q/150258 (version: 2012-05-27)},
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eprint = {https://math.stackexchange.com/q/150258},
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url = {https://math.stackexchange.com/q/150258}
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}
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@@ -1,6 +1,7 @@
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\section{Strongly Measurable Functions}
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\section{Strongly Measurable Functions}
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\label{section:strongly-measurable}
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\label{section:strongly-measurable}
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\begin{definition}[Strongly Measurable Function]
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\begin{definition}[Strongly Measurable Function]
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\label{definition:strongly-measurable}
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\label{definition:strongly-measurable}
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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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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 @@
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\label{proposition:convergence-in-measure}
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\label{proposition:convergence-in-measure}
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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:
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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:
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\begin{enumerate}
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\begin{enumerate}
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\item[(L)] $\fF$ is \hyperref[definition:locally-in-measure]{definition:locally-in-measure}.
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\item[(L)] $\fF$ is Cauchy \hyperref[locally in measure]{definition:locally-in-measure}.
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\item[(T)] For each $\eps, \delta > 0$, there exists $F \in \fF$ and $A \in \cf$ such that
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\item[(T)] For each $\eps, \delta > 0$, there exists $F \in \fF$ and $A \in \cf$ such that
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\[
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\[
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\sup_{f, g \in F}\mu(A^c \cap \bracs{d(f, g) > \delta}) < \eps
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\sup_{f, g \in F}\mu(A^c \cap \bracs{d(f, g) > \delta}) < \eps
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@@ -234,7 +234,7 @@
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\item There exists a complex Hilbert space $K$ and a *-isomorphism $\pi: A \to B(K)$.
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\item There exists a complex Hilbert space $K$ and a *-isomorphism $\pi: A \to B(K)$.
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\end{enumerate}
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\end{enumerate}
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\end{theorem}
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\end{theorem}
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\begin{proof}
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\begin{proof}[Proof, {{\cite{TownesType1}}}. ]
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(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.
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(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.
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(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 $Q \preceq P$.
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(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 $Q \preceq P$.
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