Impuls

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\underline p = {\color{Gray} \hbar} \underline k

{{p}^{\mu }}=m\frac{d{{x}^{\mu }}}{d\tau }=\gamma m\left( \begin{matrix}
   c & {{v}^{1}} & {{v}^{2}} & {{v}^{3}}  \\
\end{matrix} \right)=\left( \begin{matrix}
   \frac{E}{c} & {{p}^{i}}  \\
\end{matrix} \right)


pμpμ = m2c2

Operator

\hat{p}=\frac{\hbar }{\mathfrak{i}}\underline{\nabla }
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