Added notation for space of measurable functions.

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Bokuan Li
2026-06-21 21:08:13 -04:00
parent 66dd4b0068
commit a57686be8f
3 changed files with 11 additions and 0 deletions

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\section{Convergence in Measure}
\label{section:convergence-in-measure}
\begin{definition}[In Measure]
\label{definition:in-measure}
Let $(X, \cm, \mu)$ be a measure space, $(Y, d)$ be a metric space, then the uniform
\end{definition}
\begin{definition}[Convergence in Measure]
\label{definition:convergence-in-measure}
Let $(X, \cm, \mu)$ be a measure space, $(Y, d)$ be a metric space, and $\fF$ be a filter of $(\cm, \cb_Y)$-measurable functions, and $f$ be a $(\cm, \cb_Y)$-measurable function, then $\fF \to f$ \textbf{in measure} if for each $\eps > 0$,

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\begin{definition}[Measurable Function]
\label{definition:measurable-function}
Let $(X, \cm)$ and $(Y, \cn)$ be measurable spaces and $f: X \to Y$ be a mapping, then $f$ is \textbf{$(\cm, \cn)$-measurable} if $f^{-1}(E) \in \cm$ for all $E \in \cn$.
The set $\mathscr{M}(X; Y)$ is the \textbf{space of measurable functions} from $X$ to $Y$.
\end{definition}

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$\mathcal{B}_X$ & Borel $\sigma$-algebra on $X$. & \autoref{definition:borel-sigma-algebra} \\
$\sigma(\{f_i \mid i \in I\})$ & $\sigma$-algebra generated by the maps $\{f_i\}$. & \autoref{definition:generated-sigma-algebra-function} \\
$\bigotimes_{i \in I} \mathcal{M}_i$ & Product $\sigma$-algebra. & \autoref{definition:product-sigma-algebra} \\
$\mathscr{M}(X; Y)$ & Space of measurable functions from $X$ to $Y$. & \autoref{definition:measurable-function} \\
$\chi_E = \mathbf{1}_E$ & Indicator function of $E$. & \autoref{definition:indicator-function} \\
$\Sigma(X, \mathcal{M}; E)$ & Space of $E$-valued simple functions on $(X, \mathcal{M})$. & \autoref{definition:simple-function-standard-form} \\
$\Sigma^+(X, \mathcal{M})$ & Space of non-negative simple functions. & \autoref{definition:simple-function-scalar} \\