4-vectors

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4-vectors

Using index notation, the time and space coordinates can be combined into a single "4-vector" [math]x^{\mu},\ \mu=0,\ 1,\ 2,\ 3[/math]

[math]\begin{bmatrix} x_0 \\ x_1 \\ x_2 \\ x_3 \end{bmatrix}= \begin{bmatrix} ct \\ x \\ y \\ z \end{bmatrix}[/math]

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