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polimi-cheatsheet
GitHub Repository: polimi-cheatsheet/GAL-cheatsheet
Path: blob/master/teoria/1.vettori.tex
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\section{Vettori}
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\begin{tabular}{@{}ll@{}}
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$\vec{v} = (v_1, v_2, ..., v_n)$ & Vettore \\
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$||\vec{v}|| = \sqrt{v_1^2 + v_2^2 + ... + v_n^2}$ & Modulo o norma \\
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$
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\begin{bmatrix}
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v_1 \\[-0.3em]
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v_2 \\[-0.3em]
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\cdots \\[-0.3em]
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v_n \\
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\end{bmatrix}
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+
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\begin{bmatrix}
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w_1 \\[-0.3em]
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w_2 \\[-0.3em]
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\cdots \\[-0.3em]
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w_n \\
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\end{bmatrix}
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=
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\begin{bmatrix}
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v_1 + w_1 \\[-0.3em]
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v_2 + w_2 \\[-0.3em]
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\cdots \\[-0.3em]
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v_n + w_n \\
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\end{bmatrix}
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$ & Somma tra vettori \\
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$k \vec{v} = (k v_1, k v_2, ..., k v_n)$ & Prodotto scalare-vettore \\
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$\vec{v} \cdot \vec{w} = v_1 w_1 + v_2 w_2 + ... + v_n w_n$ & Prodotto scalare \\
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$
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\begin{bmatrix}
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x_1 \\[-0.3em]
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y_1 \\[-0.3em]
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z_1 \\
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\end{bmatrix}
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\times
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\begin{bmatrix}
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x_2 \\[-0.3em]
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y_2 \\[-0.3em]
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z_2 \\
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\end{bmatrix}
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=
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\begin{bmatrix}
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y_1z_2 - z_1y_2 \\[-0.3em]
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z_1x_2 - x_1z_2 \\[-0.3em]
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x_1y_2 - y_1x_2 \\
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\end{bmatrix}
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$ & Prodotto vettoriale \\
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$||\vec{v}+\vec{w}||^2 = ||\vec{v}||^2 + ||\vec{w}||^2$ & Se $v \perp w$ \\
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$\cos{\theta} = \frac{\vec{v} \cdot \vec{w}}{||\vec{v}|| \cdot ||\vec{w}||}$ & Angolo tra vettori \\
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$\vec{v} \perp \vec{w} \Leftrightarrow \vec{v} \cdot \vec{w} = 0$ & Vettori perpendicolari \\
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$\vec{v} \parallel \vec{w} \Leftrightarrow \vec{v} \times \vec{w} = \vec{0}$ & Vettori paralleli \\
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\end{tabular}
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