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polimi-cheatsheet
GitHub Repository: polimi-cheatsheet/GAL-cheatsheet
Path: blob/master/teoria/1.matrice-associata.tex
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\section{Matrice associata}
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$f: V \rightarrow W$
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\begin{tabular}{ll}
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Base di V & $B = \{\vec{b}_1, \vec{b}_2, ..., \vec{b}_n\}$ \\
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Base di W & $C = \{\vec{c}_1, \vec{c}_2, ..., \vec{c}_m\}$ \\
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\end{tabular}
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$A = \begin{bmatrix} f(\vec{b}_1)_{|C} & f(\vec{b}_2)_{|C} & \cdots & f(\vec{b}_n)_{|C} \end{bmatrix} \quad f(\vec{v}) = A\vec{v}$
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\vspace{0.5em}
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Cambiamento di base da $B$ a $C \quad I_{B\rightarrow C}: V \rightarrow V$
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$M_{B\rightarrow C} = \begin{bmatrix} {\vec{b}_1}_{|C} & {\vec{b}_2}_{|C} & \cdots & {\vec{b}_n}_{|C} \end{bmatrix}$
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$\vec{v}_{|C} = M_{B\rightarrow C} \cdot \vec{v}_{|B} \quad \vec{v}_{|B} = M_{B\rightarrow C}^{-1} \cdot \vec{v}_{|C}$
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\vspace{0.5em}
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Combinazione di funzioni: $f: V \rightarrow W\ [A] \quad g: W \rightarrow U\ [B]$
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$g \circ f: V \rightarrow U\ [C = B \cdot A]$
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