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[PS] Intro: Independence and finish
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semester4/ps/ps-jh/parts/00_basics/05_independence.tex
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semester4/ps/ps-jh/parts/00_basics/05_independence.tex
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\subsection{Unabhängigkeit}
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\shortdefinition $A, B \in \cF$ \bi{unabh.} falls $\P[A \cap B] = \P[A] \cdot \P[B]$
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\shortremark Falls $\P[A] \in \{0, 1\}$: $\forall B \in \cF \; \P[A \cap B] = \P[A] \P[B]$.
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Falls $A$ unabh. von sich selbst ($\P[A \cap A] = \P[A]^2$), dann $\P[A] \in \{0, 1\}$.
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\bi{Implik.}: $A$ unabh. v. $B$ $\Leftrightarrow$ $A$ unabh. v. $B^C$
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\shorttheorem Sei $\P[A], \P[B] > 0$. Dann ist equivalent:
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\begin{enumerate}[label=\textit{(\roman*)}]
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\item $\P[A \cap B] = \P[A] \cdot \P[B]$\quad \textit{($A$ und $B$ unabhängig)}
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\item $\P[A | B] = \P[A]$\quad \textit{(Eintreten von $B$ beinflusst $A$ nicht)}
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\item $\P[B | A] = \P[B]$\quad \textit{(Eintreten von $A$ beinflusst $B$ nicht)}
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\end{enumerate}
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\shortdefinition $I$ eine beliebige Menge. $(A_i)_{i \in I}$ \bi{unabhängig} falls:
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\[
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\forall j \subseteq I \text{ endlich} \quad \P\left[ \bigcap_{j \in J} A_j \right] = \prod_{j \in J} \P[A_j]
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\]
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\input{parts/00_basics/02_properties-of-events.tex}
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\input{parts/00_basics/02_properties-of-events.tex}
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\input{parts/00_basics/03_properties-of-measures.tex}
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\input{parts/00_basics/03_properties-of-measures.tex}
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\input{parts/00_basics/04_conditional-probability.tex}
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\input{parts/00_basics/04_conditional-probability.tex}
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% \input{parts/00_basics/}
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\input{parts/00_basics/05_independence.tex}
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\newsection
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\section{Zufallsvar., Verteilungsfunktionen}
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\section{Zufallsvar., Verteilungsfunktionen}
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\input{parts/01_random-variables/00_definition.tex}
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\input{parts/01_random-variables/00_definition.tex}
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% \input{parts/01_random-variables/}
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% \input{parts/01_random-variables/}
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