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\chapter{Lineare Algebra}
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\chapter{Lineare Algebra}
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\section{Identitäten}
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\section{Allgemeines}
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\subsection*{Definitionen}
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\subsubsection*{Levi-Civita-Symbol:}
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\begin{math}
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\begin{math}
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A^{-1} = \inlinematrix{a & b \\ c & d}^{-1} = \frac{1}{ad - bc} \inlinematrix{d & -b \\ -c & a}
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\varepsilon_{12\dots n} = 1 \\
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\varepsilon_{ij\dots u\dots v\dots} = -\varepsilon_{ij\dots v\dots u\dots}\\
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\varepsilon_{ij\dots u\dots u\dots} = 0 \\
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\levicivita{i,j,k} =
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\begin{cases}
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+1, & \mbox{falls }(i,j,k,\dots) \mbox{ eine gerade Permutation von } (1,2,3,\dots) \mbox{ ist,} \\
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-1, & \mbox{falls }(i,j,k,\dots) \mbox{ eine ungerade Permutation von } (1,2,3,\dots) \mbox{ ist,} \\
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0, & \mbox{wenn mindestens zwei Indizes gleich sind.}
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\end{cases}
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(\vec{a} \times \vec{b})_i = \sum_{j=1}^3 \sum_{k=1}^3 \levicivita{ijk} a_j b_k \\
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\vec{a} \times \vec{b} = \levicivita{ijk} a_j b_k \vec{e_i} = \levicivita{ijk} a_i b_j \vec{e_k} \\
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\det A = \levicivita{i_1 i_2 \dots i_n} A_{1i_1} A_{2i_2} \dots A_{ni_n}
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\end{math}
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\end{math}
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\subsubsection*{Kronecker-Delta}
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$\krondelta{i,j}= \begin{cases} 1 & \mbox{falls } i=j \\ 0 & \mbox{falls } i \neq j \end{cases}$ \\s
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Die $n\times n$-Einheitsmatrix kann als $(\krondelta{ij})_{i,j\in\{1,\ldots,n\}}$ geschrieben werden.
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\section{Matrix-Operationen}
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\subsection*{Inversion}
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\begin{math}
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\hypertarget{fs_mtrx_inv_2d}{A^{-1} = \inlinematrix{a & b \\ c & d}^{-1} = \frac{1}{ad - bc} \inlinematrix{d & -b \\ -c & a}}
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\end{math}
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14
ueb1.tex
14
ueb1.tex
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\section{Aufgabe 2: Pauli Matrizen}
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\section{Aufgabe 2: Pauli Matrizen}
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\subsection*{a)}
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\subsection*{a)}
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\begin{math}
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\textbf{\sigma} = (\sigma_x, \sigma_y, \sigma_z) \\
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\textbf{\a},\textbf{\b} \in \setR
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\end{math}
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\begin{align}
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(\textbf{a \cdot \sigma})(\textbf{b \cdot \sigma}) &= \one (\textbf{a \cdot b} + \i \textbf{\sigma} \cdot (\textbf{\a} \times \textbf{b}) \\
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\sum a_\alpha b_\beta \sigma_\alpha \sigma_\beta &= \\
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\sum a_\alpha b_\beta ( \krondelta{\alpha \beta} \one + \i \levicivita{\alpha,\beta,\gamma} \sigma_\gamma ) &= \\
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\sum a_\alpha b_\beta \krondelta{\alpha \beta} \cdot \one + \i a_\alpha b_\beta \levicivita{\alpha,\beta,\gamma} \sigma_\gamma &= \\
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\one (\textbf{a \cdot b} + \i \sigma \cdot (a \times b)
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\end{align}
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\subsection*{b)}
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\subsection*{b)}
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\subsection*{c)}
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\subsection*{c)}
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\subsection*{d)}
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\subsection*{d)}
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2
ueb7.tex
2
ueb7.tex
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\inlinematrix{e^{a \cdot a} & e^{-a \cdot a} \\ q e^{a \cdot a} & q e^{-a \cdot a}} \inlinematrix{C & D} = \inlinematrix{\tilde{E} e^{\i k a} \\ \i k \tilde{E} e^{\i k a}}
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\inlinematrix{e^{a \cdot a} & e^{-a \cdot a} \\ q e^{a \cdot a} & q e^{-a \cdot a}} \inlinematrix{C & D} = \inlinematrix{\tilde{E} e^{\i k a} \\ \i k \tilde{E} e^{\i k a}}
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\end{math}
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\end{math}
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mit den Inversen von: (1) und (2) % geschweifte klammern unter matrix 1 und 2 setzen
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mit den \hyperlink{fs_mtrx_inv_2d}{Inversen} von: (1) und (2) % geschweifte klammern unter matrix 1 und 2 setzen
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\begin{math}
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\begin{math}
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%mit maxima berechnet
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%mit maxima berechnet
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